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Posted: 2/10/2014 1:31:53 PM EDT
[#1]
The well-intentioned effort of the OP notwithstanding, I submit the last six pages of this Thread as evidence that the AR-15 and the Bullpup, each in their own ways, representing excellent examples of firearms design, not unlike East and West, never the twain shall meet. Indeed, the 2nd and 3rd images accompanying the OP's 2/1/2014 12:43:03 PM Post, previous page (shouldering this proposed design by a left-handed shooter would place his left cheek over the ejection port), underscore the necessity of a firearms design which allows ambi-ejection, if a Bullpup configuration is intended: Beretta's soon-to-be released ARX100, incorporating instant left- / right-side ejection, for an example.
I dare state that had the OP chosen the ARX100, instead of the AR-15, as the basis for his Bullpup, we'd have reached a respectable point in our goal, by now. And, then, there's the matter of stamped steel --- in the 21st Century . . . |
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Posted: 2/10/2014 4:36:50 PM EDT
[#2]
Quote HistoryQuoted:
Going cheap on the mag well? How cheap do you want? Perhaps Airsoft cheap? http://www.feinsteinproject.org/loes/effortbloomberg/subeffortg36/subEffortG36.html 56K death, BTW. I was thinking just little steel blocks spot welded in the lower. I do like the mag release tho. I have been trying to figure out If i can get a mag release like the G36 or tavor with 3 parts (like the AR). Trying to use the ak lever and spring but it may not work out. The mag release is something I need to think about a little more. |
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Posted: 2/10/2014 4:44:28 PM EDT
[#3]
Design a bullpup stock that works around an AR lower. Slap on a Sebru upper. No need for a buffer/buffer spring so no need for a receiver extension. Win.
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Posted: 2/13/2014 11:06:53 AM EDT
[#4]
I have been working on a bullpup design for a while now and agree with the guys on here that have said start with new components rather than use the AR15 internal workings. Maybe save the use of the bolt, barrel, and barrel extension. Possibly even use the rotation pin location for the bolt.
I would like the see the Longziz (SP?) refined more. The concept stock looks rough....really rough, but could be a winner. |
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Posted: 2/13/2014 11:33:44 AM EDT
[#5]
Quote HistoryQuoted:
I have been working on a bullpup design for a while now and agree with the guys on here that have said start with new components rather than use the AR15 internal workings. Maybe save the use of the bolt, barrel, and barrel extension. Possibly even use the rotation pin location for the bolt. I would like the see the Longziz (SP?) refined more. The concept stock looks rough....really rough, but could be a winner. Yes the Longziz was exciting and I wish he would pop back up |
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Posted: 2/13/2014 12:38:26 PM EDT
[#6]
The Longziz #1 Prototype, with instant left- / right-side ejection, is brilliant! Combined with the Longziz #2 Universal AR Magazine, it represents the future of multi-purpose Bullpups. Sad to see it missing from the scene.
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Posted: 2/13/2014 12:45:21 PM EDT
[#7]
Quote HistoryQuoted:
Yes the Longziz was exciting and I wish he would pop back up Quote HistoryQuoted:
Quoted:
I have been working on a bullpup design for a while now and agree with the guys on here that have said start with new components rather than use the AR15 internal workings. Maybe save the use of the bolt, barrel, and barrel extension. Possibly even use the rotation pin location for the bolt. I would like the see the Longziz (SP?) refined more. The concept stock looks rough....really rough, but could be a winner. Yes the Longziz was exciting and I wish he would pop back up Did he ever get things hardened and actually fire his bullpup? The concept was cool, the execution of the carrier concerned me a bit, it's been a while since I've looked at it, but I wanted to see how it held up. |
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Posted: 2/13/2014 2:09:13 PM EDT
[#8]
Quoted:
Quoted:
Quoted:
I have been working on a bullpup design for a while now and agree with the guys on here that have said start with new components rather than use the AR15 internal workings. Maybe save the use of the bolt, barrel, and barrel extension. Possibly even use the rotation pin location for the bolt. I would like the see the Longziz (SP?) refined more. The concept stock looks rough....really rough, but could be a winner. Yes the Longziz was exciting and I wish he would pop back up Did he ever get things hardened and actually fire his bullpup? The concept was cool, the execution of the carrier concerned me a bit, it's been a while since I've looked at it, but I wanted to see how it held up. If you can't go forward or downward eject I think longziz was close. I didn't like the fact you had to open the action to reconfigure on the Longziz. I wouldn't have done it that way. I think you either have a dedicated lefty or righty bolt (tavor/aug) , or you switch ejection with a deflector and not the bolt. |
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Posted: 2/13/2014 3:11:09 PM EDT
[#9]
On Your Side: Beretta ARX100 By Gary Paul Johnston, Shooting Illustrated, December, 2013, PP 43, 44, Switching in Seconds --- "The seven-lug, rotating bolt has two extractors, one on either side. These not only provide positive extraction; either can be selected to serve as the ejector. Open on both sides of the ARX100, the ejection port allows the bolt to expel brass to the right or left, depending on the shooter's choice.
"A sliding steel plate housed in the lower receiver's polymer buffer plate governs which side brass is ejected from the action. Accessed by a hole in either side of the upper receiver forward of the buttstock, the steel plate can be pushed to the right or left by using a bullet tip or other pointed object. If the plate is pushed to the right, the ARX100 will eject to the right. If it's pushed to the left, ejection will occur on that side. "A clever design makes this possible. On each side of the bolt, a spring-loaded rod connected to its own extractor/ejector extends to the rear. Pushed to the right, the plate blocks the left extractor rod when the bolt travels to the rear during cycling. The blocked rod forces the left extracor forward of the bolt head to now serve as an ejector. While the right extractor retains the rim of the cartridge case, the ejector pushes on the left side of the case and ejects it to the right. Moving the plate to the left produces the opposite effect, turning the right extractor ino an ejector." If only Beretta went all the way --- and gave us an ARX100 Bullpup! |
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Posted: 2/13/2014 3:17:14 PM EDT
[#10]
Quote HistoryQuoted:
On Your Side: Beretta ARX100 By Gary Paul Johnston, Shooting Illustrated, December, 2013, PP 43, 44, Switching in Seconds --- "The seven-lug, rotating bolt has two extractors, one on either side. These not only provide positive extraction; either can be selected to serve as the ejector. Open on both sides of the ARX100, the ejection port allows the bolt to expel brass to the right or left, depending on the shooter's choice. "A sliding steel plate housed in the lower receiver's polymer buffer plate governs which side brass is ejected from the action. Accessed by a hole in either side of the upper receiver forward of the buttstock, the steel plate can be pushed to the right or left by using a bullet tip or other pointed object. If the plate is pushed to the right, the ARX100 will eject to the right. If it's pushed to the left, ejection will occur on that side. "A clever design makes this possible. On each side of the bolt, a spring-loaded rod connected to its own extractor/ejector extends to the rear. Pushed to the right, the plate blocks the left extractor rod when the bolt travels to the rear during cycling. The blocked rod forces the left extracor forward of the bolt head to now serve as an ejector. While the right extractor retains the rim of the cartridge case, the ejector pushes on the left side of the case and ejects it to the right. Moving the plate to the left produces the opposite effect, turning the right extractor ino an ejector." If only Beretta went all the way --- and gave us an ARX100 Bullpup! Jump to around 2:20 
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Posted: 2/13/2014 3:53:04 PM EDT
[#11]
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If you can't go forward or downward eject I think longziz was close. I didn't like the fact you had to open the action to reconfigure on the Longziz. I wouldn't have done it that way. . . . Longziz, December 1, 2011, "When I first started this project [Longziz #1], I didn't know about ARX-160. I didn't aware its existence until early this year, around April or May. When I first learned it, I almost want to quit mine, because I think it changes sides one less action needed than mine." |
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Posted: 2/13/2014 5:24:54 PM EDT
[#12]
I like the idea of an ejection port on the bottom side of the rifle. Doesn't the new version of Keltec's bullpup offer this feature?
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Posted: 2/13/2014 5:28:31 PM EDT
[#13]
Quote HistoryQuoted:
I like the idea of an ejection port on the bottom side of the rifle. Doesn't the new version of Keltec's bullpup offer this feature? Yep, right into your lap... 
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Posted: 2/16/2014 2:24:46 PM EDT
[#14]
I was doing some work on the upper and decided to play around with adding texturing to the grip and forend.
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Posted: 2/16/2014 4:11:08 PM EDT
[#15]
Quote History"It is believed that 85 - 90 percent of the world's pupulation is right handed. However, about 2/3 of the population if right eye dominant, and 1/3 is left eye dominant. . . . With a shoulder-fired weapon, such as a rifle of shotgun, the only satisfactory solution is to learn to shoot from the shoulder on the same side as the dominant eye." --- The Cross-Dominant Shooter http://www.usconcealedcarry.com/training-tactical/the-cross-dominant-shooter/ |
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Posted: 2/17/2014 6:42:26 PM EDT
[#16]
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I was doing some work on the upper and decided to play around with adding texturing to the grip and forend. http://i.imgur.com/RIpEvKl.png Now, that you've got us out on a limb, as it were, with your dandy image-maker (and, in view of the unfavorable Poll for an AR-based Bullpup, using the cumbersom Bolt Carrier Group), I think it would be helpful if you would present an image of an ARX100-based Bullpup (just get rid of the buttstock and give us a forward-mounted pistol grip-trigger assembly), for comparison. And, perhaps, add a Longziz #1-style switchable cheekpiece. Thanks! 
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Posted: 2/19/2014 7:54:43 AM EDT
[#17]
Quote HistoryQuoted:Now, that you've got us out on a limb, as it were, with your dandy image-maker (and, in view of the unfavorable Poll for an AR-based Bullpup, using the cumbersom Bolt Carrier Group), I think it would be helpful if you would present an image of an ARX100-based Bullpup (just get rid of the buttstock and give us a forward-mounted pistol grip-trigger assembly), for comparison. And, perhaps, add a Longziz #1-style switchable cheekpiece. Thanks!
http://i62.tinypic.com/2z7fjpg.jpg Oooh - it has a lower rail. Mount the pistol grip to the rail, so it's adjustable for LOP : ) |
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Posted: 2/21/2014 9:22:09 PM EDT
[#18]
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Oooh - it has a lower rail. Mount the pistol grip to the rail, so it's adjustable for LOP : ) This ambidextrous contoured-style Picatinny Rail-mounted fore grip (with sealed storage compartment) offers excellent one-handed control, on a Bullpup 
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Posted: 2/22/2014 11:31:01 PM EDT
[#19]
Quote HistoryQuoted:
On Your Side: Beretta ARX100 By Gary Paul Johnston, Shooting Illustrated, December, 2013, PP 43, 44, Switching in Seconds --- "The seven-lug, rotating bolt has two extractors, one on either side. These not only provide positive extraction; either can be selected to serve as the ejector. Open on both sides of the ARX100, the ejection port allows the bolt to expel brass to the right or left, depending on the shooter's choice. "A sliding steel plate housed in the lower receiver's polymer buffer plate governs which side brass is ejected from the action. Accessed by a hole in either side of the upper receiver forward of the buttstock, the steel plate can be pushed to the right or left by using a bullet tip or other pointed object. If the plate is pushed to the right, the ARX100 will eject to the right. If it's pushed to the left, ejection will occur on that side. "A clever design makes this possible. On each side of the bolt, a spring-loaded rod connected to its own extractor/ejector extends to the rear. Pushed to the right, the plate blocks the left extractor rod when the bolt travels to the rear during cycling. The blocked rod forces the left extracor forward of the bolt head to now serve as an ejector. While the right extractor retains the rim of the cartridge case, the ejector pushes on the left side of the case and ejects it to the right. Moving the plate to the left produces the opposite effect, turning the right extractor ino an ejector." If only Beretta went all the way --- and gave us an ARX100 Bullpup! . . . "They are also including in the [ARX-160] kit a removable ejection port cover that can be attached by way of the two sling keepers on either side of the receiver. This cover is for use if you are in a very austere environment and want to limit the possibility of debris entering the mechanism. It will totally block out which ever side of the receiber you clip it onto. This, of course precludes the option of having the charging handle on the opposite side of ejection, but I can see it will have its uses when needed [as in a Bullpup configuration]. You can easily remove it again by popping it back off (impossible to do by accident). It is made of polymer. . . ." --- http://www.m4carbine.net/showthread.php?97559-Beretta-ARX160-Update/page4 (See Reply #63). |
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Posted: 3/4/2014 4:36:13 PM EDT
[#20]
I'm totally redoing the recoil system and thus most of the design. In addition to my college text books I found this article great for anyone looking to design their own spring/s. He talks about various type of traditional and strange spring configurations (rectangular wire, nested springs etc). The one thing that I had never really seen articulated but always had a good feel for was the more material you use for a given spring (larger diameter/longer length) the lower the stress.
http://www.dtic.mil/dtic/tr/fulltext/u2/a077113.pdf |
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Posted: 4/10/2014 11:52:39 PM EDT
[#21]
Update?
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Posted: 4/11/2014 2:46:43 AM EDT
[#22]
I'm going thru the standard stage of design called "churn". I've abandon the extension spring and am visiting the flat spring or large diameter short spring or nested spring behind the carrier. It really comes down to I need to pick a spring/recoil system and design the firearm around it. Its actually quite challenging to get the right LOP and spring rate/buffer mass.
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Posted: 4/12/2014 12:57:52 PM EDT
[#23]
if you can make a bullpup kit that uses the original AR parts minus furniture and price it reasonably, it would be awesome.
I think folks at ACE Riflestocks at one time tried it but stopped. |
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Posted: 4/15/2014 6:35:01 PM EDT
[#24]
Quote HistoryQuoted:
I'm going thru the standard stage of design called "churn". I've abandon the extension spring and am visiting the flat spring or large diameter short spring or nested spring behind the carrier. It really comes down to I need to pick a spring/recoil system and design the firearm around it. Its actually quite challenging to get the right LOP and spring rate/buffer mass. After you've thoroughly peregrinated your "spring" fever, perhaps, you might consider designing a 45-degree forward-ejection system, one which allows the shooter to just stick the thing (the unstocked buffer tube assembly) over their shoulder --- and fire away! It works, even with this AR-10! 
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Posted: 4/15/2014 6:54:08 PM EDT
[#25]
how about this video? Longziz AR based bullpup
He does change the bolt carrier though. The triangular Longziz #1 bolt carrier next to an AR-15 carrier. http://www.thefirearmblog.com/blog/wp-content/uploads/2011/11/419x314xbolt-tfb.jpg.pagespeed.ic.cubpsDG0Xp.jpg AR based bullpup by Longziz Quote HistoryQuoted:
The well-intentioned effort of the OP notwithstanding, I submit the last six pages of this Thread as evidence that the AR-15 and the Bullpup, each in their own ways, representing excellent examples of firearms design, not unlike East and West, never the twain shall meet. Indeed, the 2nd and 3rd images accompanying the OP's 2/1/2014 12:43:03 PM Post, previous page (shouldering this proposed design by a left-handed shooter would place his left cheek over the ejection port), underscore the necessity of a firearms design which allows ambi-ejection, if a Bullpup configuration is intended: Beretta's soon-to-be released ARX100, incorporating instant left- / right-side ejection, for an example. I dare state that had the OP chosen the ARX100, instead of the AR-15, as the basis for his Bullpup, we'd have reached a respectable point in our goal, by now. And, then, there's the matter of stamped steel --- in the 21st Century . . . |
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Posted: 4/16/2014 4:49:36 AM EDT
[#26]
Quote HistoryQuoted:
After you've thoroughly peregrinated your "spring" fever, perhaps, you might consider designing a 45-degree forward-ejection system, one which allows the shooter to just stick the thing (the unstocked buffer tube assembly) over their shoulder --- and fire away! It works, even with this AR-10! Well, *THAT* looks comfortable .... NOT! Interesting idea, and I applaud the backyard innovation, but comparing that to a bullpup is a lot like saying "Instead of driving a Ferrari fast, why not ride your Kia down off a cliff?" |
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Posted: 4/16/2014 4:30:29 PM EDT
[#27]
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Well, *THAT* looks comfortable .... NOT! Interesting idea, and I applaud the backyard innovation, but comparing that to a bullpup is a lot like saying "Instead of driving a Ferrari fast, why not ride your Kia down off a cliff?" Quote HistoryQuoted:
Quoted:
After you've thoroughly peregrinated your "spring" fever, perhaps, you might consider designing a 45-degree forward-ejection system, one which allows the shooter to just stick the thing (the unstocked buffer tube assembly) over their shoulder --- and fire away! It works, even with this AR-10! Well, *THAT* looks comfortable .... NOT! Interesting idea, and I applaud the backyard innovation, but comparing that to a bullpup is a lot like saying "Instead of driving a Ferrari fast, why not ride your Kia down off a cliff?" Actually, "THAT" is comfortable. And, though "a 45-degree forward-ejection system" would be helpful within the overall Bullpup design such as envisioned by the OP, my Post doesn't suggest "THAT" is a Bullpup. |
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Posted: 4/17/2014 5:04:04 AM EDT
[#28]
Quote HistoryQuoted:
my Post doesn't suggest "THAT" is a Bullpup Quote HistoryQuoted:
my Post doesn't suggest "THAT" is a Bullpup I beg to differ. Quoted:
After you've thoroughly peregrinated your "spring" fever, perhaps, you might consider designing a 45-degree forward-ejection system, one which allows the shooter to just stick the thing (the unstocked buffer tube assembly) over their shoulder --- and fire away! You insult the OP's plan and process (mangling a perfectly good $5 word in doing so) and say he should allow the shooter to "just stick the thing (the unstocked buffer tube assembly) over their shoulder" all within the context of your "critique". So your post reads quite clearly as "Stop your foolishness and just do what someone else already did!" The sheer ridiculousness of your suggestion makes the whole thing backfire IMNSHO, but feel free to carry on providing amusement value. Richard P.S. Bold text should be reserved for emphasis, using it for every word in every posting has the opposite effect. |
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Posted: 4/17/2014 5:46:26 AM EDT
[#29]
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. . . I think the longziz #1 is ahead of you though.... Agreed! |
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Posted: 4/17/2014 5:56:59 AM EDT
[#30]
Quote HistoryQuoted:
Agreed! Quote HistoryQuoted:
Quoted:
. . . I think the longziz #1 is ahead of you though.... Agreed! Anone seen it fire yet? I'm not one to talk, my PDR is dragging on and on, but I did pick up some S7 plate for the bolt the other day, since it's easier to harden properly. |
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Posted: 5/6/2014 7:33:26 PM EDT
[#31]
My concept evolved back into somewhat of a combination of my original idea and my second idea. For the lower, its an aluminum skeleton (or polymer) but covered in a plastic (or wood) clam-shell. For the upper, its something like a regular ar upper. I broke down and started totally redoing the carrier body (like many suggested) to accept 2 ak syle springs. The new carrier will yield less parts overall.
Common parts are FCG Mag catch system bolt dust cover Gas system FSB Barrel Forend system Grip Rear sling swivel Front takedown components 
I got the carrier in the general shape i want. The charging handles will reciprocate (they will be located in roughly the same location as on a standard AK with respect to the grip) and provide an anti bounce weight equivalent to the AR 15 buffer weights. As of now I can use AK wireform spring guides for the size of spring I need. Its kind of strange how that is working out. The exhaust vents need to be added to the carrier as well as the cam slot (among other things) 
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Posted: 5/6/2014 7:49:38 PM EDT
[#32]
That's an impressive amount of compatibility. Does it end up shorter than an AR pistol w/ the short pistol buffer tubes?
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Posted: 5/7/2014 2:41:28 AM EDT
[#33]
Quote HistoryQuoted:
That's an impressive amount of compatibility. Does it end up shorter than an AR pistol w/ the short pistol buffer tubes? Well the farthest back the recoil springs go is still within the farthest that the unmodified BCG travels. So if you are talking about a pistol that uses an unmodified BCG, then it is shorter. But if you are talking about a pistol that uses a modified BCG, it may be similar. |
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Posted: 5/9/2014 12:03:56 AM EDT
[#34]
Engineers. They have to make everything ugly.
Why is there a semi-circular recess between the pistol grip and the rear stock? How will the trigger linkage work? |
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Posted: 5/9/2014 3:58:07 AM EDT
[#35]
the semi circular cut you are talking about may be for the safety
Coincidentally I worked a little on the trigger linkage. I'm liking just a standard 4 bar. i'm thinking of making the "trigger cradle" link have the same axis as the trigger. This means there won't be any linear sliding friction...it will be all rotational friction. The trigger pull will also be about 2X longer than the standard ar trigger and that should help with keeping the trigger a little safer. I want to fit the ar trigger spring in the front trigger also to help keep the trigger un pulled. 
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Posted: 5/9/2014 5:50:23 AM EDT
[#36]
Quote HistoryQuoted:
Engineers. They have to make everything ugly.
Why is there a semi-circular recess between the pistol grip and the rear stock? How will the trigger linkage work? That's where your thumb goes. |
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Posted: 5/9/2014 5:53:06 AM EDT
[#37]
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Probably easier to design a new firearm altogether then try to fit an existing one into another form... But if this used a RR M16 lower...... |
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Posted: 5/9/2014 5:56:45 AM EDT
[#38]
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But if this used a RR M16 lower...... Quote HistoryQuoted:
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Probably easier to design a new firearm altogether then try to fit an existing one into another form... But if this used a RR M16 lower...... You going to cut a slot in your $20K lower for the forward trigger linkage? This I've got to see. 
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Posted: 5/9/2014 7:50:06 AM EDT
[#39]
Quote HistoryQuoted:
You going to cut a slot in your $20K lower for the forward trigger linkage? This I've got to see. Quote HistoryQuoted:
Quoted:
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Probably easier to design a new firearm altogether then try to fit an existing one into another form... But if this used a RR M16 lower...... You going to cut a slot in your $20K lower for the forward trigger linkage? This I've got to see. Not sure, but I think his whole reason for the funky linkage being high was to clear the lower. |
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Posted: 5/9/2014 4:26:07 PM EDT
[#40]
The idea behind the trigger linkage is to increase the trigger pull so that i can fit some sort of trigger safety and the long trigger pull will make the trigger system more tolerant of slop. The ultimate goal in the trigger would be to make it drop safe (think Glock Safety). Longer trigger pull will also allow the ar trigger portion of the trigger weight to be reduced due to more mechanical advantage.
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Posted: 5/9/2014 5:52:03 PM EDT
[#41]
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The BCG is shown in its rearmost position, out of battery and ready to strip a fresh round if not being held by the bolt catch. Quote HistoryQuoted:
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So the BCG has no room to move at all..... looks like a fail to me. The BCG is shown in its rearmost position, out of battery and ready to strip a fresh round if not being held by the bolt catch. ...and where is the buffer/buffer spring? |
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Posted: 5/10/2014 7:02:12 AM EDT
[#42]
Quote HistoryQuoted:
...and where is the buffer/buffer spring? Quote HistoryQuoted:
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So the BCG has no room to move at all..... looks like a fail to me. The BCG is shown in its rearmost position, out of battery and ready to strip a fresh round if not being held by the bolt catch. ...and where is the buffer/buffer spring? I've gone thru a few ideas. Right now the two captured recoil spring assembly fits into the back of the modified carrier. |
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Posted: 5/15/2014 3:57:57 AM EDT
[#43]
I wanted to compare how the rifle to another bullpup so I chose the venerable TAVOR. The comparison made me want to do a couple design changes. Here is how the design is shaking out. One interesting note is that the published overall length of the TAVOR is without the flash hider.
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Posted: 5/15/2014 4:40:17 AM EDT
[#44]
Quote HistoryQuoted:
I wanted to compare how the rifle to another bullpup so I chose the venerable TAVOR. The comparison made me want to do a couple design changes. Here is how the design is shaking out. One interesting note is that the published overall length of the TAVOR is without the flash hider. http://i.imgur.com/lSeU6oY.png Interestingly enough that bottom bullpup looks a lot like the FAL test bullpup from the early dev trials. :) keep up the great work i've been following this thread with interest. |
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Posted: 5/15/2014 7:46:58 PM EDT
[#45]
In that we're using the Tavor SAR as a comparison, which offers left-handed shooters left-side ejection using an optional left-hand Bolt, what are your plans for making your design both left- and right-hand user-friendly?
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Posted: 5/16/2014 2:38:21 PM EDT
[#46]
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In that we're using the Tavor SAR as a comparison, which offers left-handed shooters left-side ejection using an optional left-hand Bolt, what are your plans for making your design both left- and right-hand user-friendly? Fair question. I would on use a left hand AR 15 bolt. The right hand carrier should technically still work. It may need some modification however to be converted. I want to weld or rivet the ejection port not in use. Where to vent the gas is an issue. I'm trying to make the carrier gas exhaust configurable or able to vent the gas forward. Otherwise you would need a left hand carrier. |
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Posted: 5/16/2014 11:57:29 PM EDT
[#47]
Speed reading pages 2 thru 8 and there are two things that really jump out at me.
Minimal mention of the Bushmaster Arm Pistol from Mack Gwinn Jr, 
Even less mention of the KAC PDW (TSWG), considering the number of pages discussing spring design and placement 
Operating the PDW’s bolt carrier are dual short-stroke gas pistons, each with its own spring, which are activated from dual gas cylinders off each side of the gas block/front sight base. All recoil and piston springs are housed inside of the gun |
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Posted: 5/17/2014 1:01:02 AM EDT
[#48]
. . . And, the Individual Multi-Purpose Weapon IMP-221, chambered for the .221 Fireball
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Posted: 6/8/2014 5:52:13 AM EDT
[#49]
Yet another example of an attempt to "Bullpup" the AR-15:
http://bullpupforum.com/index.php?topic=6146.msg58420 |
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Posted: 6/8/2014 6:07:11 AM EDT
[#50]
Quote HistoryQuoted:
Yet another example of an attempt to "Bullpup" the AR-15: http://bullpupforum.com/index.php?topic=6146.msg58420 So i have a question on those...i'm guessing because they are for personal use the lowers can just be made and there is no need for atf stamps etc for construction of a firearm or am i way off? I've been toying with some ideas for a long time and I need to sit down and get them done. |
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