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Posted: 2/22/2006 5:32:38 PM EDT
[#1]
IM Tweak.
He helped me with a similar but differnt product and he is very knkowledgble and helpful |
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Posted: 2/22/2006 7:08:42 PM EDT
[#2]
Hope that works out for you. (you might what to read the tacked posts once in a while). |
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Posted: 2/22/2006 7:44:57 PM EDT
[#3]
Forward ejection is caused by the following,
1. The buffer is not controlling the end of stroke (lack of rear dead blow effect/stall, and/or short stroking could be causing the problem if the buffer is a know working unit). 2. A sticky ejector that is not pivoting the spent case off the bolt at rearward stall. 3. A milling bur’d extractor that is digging into the case rim, and hindering the end of rearward stroke pivot of the spent case off the bolt. Area’s to check, Single round load the rifle from a mag, and check for short stroking (bolt locking back on the bolt catch after the round has fired). Pull the ejector and the extractor to check for burs. On the extractor, check the claw and the rim relief areas. On the ejector, check the bolt channel, and confirm that the ejector is moving in/out of the bolt without binding. As for the buffer just shake it. You should hear a clucking sound, and not the sound of BB’s rattling around. Note: normal ejection distance of the spent brass should be around 15’. If the spent case contacts the deflector on the way out doesn’t mater, but you do want a rearward ejection path (unless you clipped the ejector spring to indeed get a forward ejection path). |
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Posted: 2/22/2006 8:41:37 PM EDT
[#4]
I ran the checks as well as I could without being able to remove the ejector.The rifle passed the short stroke test.(never had any problems with FTF/FTE or anything)There are no visible burrs on any of the parts and both the ejector and extractor move nicely without binding.The buffer does have the clucking sound that you described.
I have noticed that the rim of the empty brass does have a pretty good bite mark on it. Back when I had 2 other ARs (both fixed stock 20in rifles) I swaped around BCGs and the problem stayed with the carbine. E.T.A. I also noticed a small dent in my brass (all of them) that matched up with the rear of the ejection port. Kind of like the casing is being slamed into the edge of the opening. Do you think the ejector is working too well and the brass is bouncing off of the upper and sending it forward? |
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Posted: 2/22/2006 9:21:26 PM EDT
[#5]
Pull the charging handle all the way back and confirm that the bolt face stops around 1/4"-3/8" forward of the back of ejection port. If the bolt will retract to/past the back edge of the ejection port, then the cases may be tagging the port and causing the dents.
If this is the problem, then confirm that the receiver extension is screwed in to the receiver correctly to limit the buffer/B/C. If needed (read the extension is retaining the buffer retaining pin correctly), then there is the option of shorting the front of the tube a few winds to position the bolt during end of stroke correctly (read all the other parts in spec, but the buffy tube inner cavity milled too deep and causing the problem). |
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Posted: 2/22/2006 9:39:55 PM EDT
[#6]
There we go. When I pull the C/H all the way back, the bolt totally disappears behind the opening. When I lock the BCG back I can see about 3/8in in the port. The buffer tube is threaded in as far as it will go without binding on the retainer. So I have to shorten the tube?
E.T.A. If I cut that much off of the tube, the stock wouldn't lock in the forward position. Could the buffer it's self be too short? |
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Posted: 2/22/2006 10:03:02 PM EDT
[#7]
Get Armalite on the phone in the morning to fix/send you the needed part (s) to correct the problem.
As for buffers, there are only two sizes, and if the butt stock were set up to use a full-length unit, then you would have carrier key embedment marks on the top ring of the lower receiver when using a carbine buffer.  |
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Posted: 2/23/2006 3:47:11 AM EDT
[#8]
Hey Dano....?IM sent......r u you a MOD or zit faced teen. i was only trying to help. your sarcasm is Lame for a member but for a mod i think its a joke. if i did something out of line by giving out anothers screen name thats different. Didn't think that was in the COC.
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Posted: 2/23/2006 4:13:24 AM EDT
[#9]
Tweak will be unuavailable for a little while, I think it has something to do with jail or something... |
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Posted: 2/23/2006 4:22:55 AM EDT
[#10]
As Dano523 said, read the tacked post, specifically the one about Tweak. He won't be with us for a bit. 
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Posted: 2/23/2006 4:57:43 AM EDT
[#11]
OOOH, sorry bout that. thought he was refering to the technical threads. I hope he didn't f-up too bad. He's is a huge asset to the site. My honest apology Dano...i mis-understood i think we need a icon that denotes "foot in mouth"
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Posted: 2/23/2006 5:02:01 AM EDT
[#12]
 Dano523's a cool enough guy that I don't think he'll wanna kick you in the balls or anything. Don't sweat it.
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Posted: 2/23/2006 5:18:42 AM EDT
[#13]
just read the Tweak threads
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Posted: 2/23/2006 9:19:04 AM EDT
[#14]
What is the correct lenth for the buffer tube and what do I tell Armalite when I call them?
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Posted: 2/24/2006 4:49:25 AM EDT
[#15]
I don't have the correct cavity depth that the receiver extension should be right now (posting this from my laptop), so maybe someone else can post it, or it you can wait until this weekend, I can pull it down off my home computer when I'm there. |
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Posted: 2/24/2006 10:17:38 AM EDT
[#16]
That would be great if you or someone else could give me that spec. I looked all over the place and didn't find it. I don't mind waiting because it will be monday before I will hear back from Armalite anyway.
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Posted: 2/24/2006 7:01:05 PM EDT
[#17]
OK, I've been looking at this thred several times, and I guess I have to ask because I'm new. My slabside with no deflector lands the brass about 5-7 feet away at 5 o'clock. My Bushmaster 11.5/5.5 upper with deflector puts the brass about the same distance away but at about 2 o'clock with an occasional flyer at 3. The slabside is a Colt upper with an Eagle lower, traded for it in December. The Bushmaster upper I got in a trade last month (previous owner stated he shot less than 200 rounds through it ,bought the complete rifle but broke it up for trade), bought a DPMS lower with LPK and 6 position stock installed.
Are these weapons ejecting where they should be or do I got some tuning to do? |
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Posted: 2/24/2006 7:50:47 PM EDT
[#18]
A1/A2 receiver extension inner cavity depth is 9-5/8" from the inner back of tube, to the bottom lip where the lip of it retains the buffer retention pin outer edge down.
A Carbine receiver extension is 7" from the same points. The difference between a carbine to standard buffer is 2-5/8", and the reason for the different inner void lengths. Note: give or take a 16th of an inch variable in the lengths of the two receiver extension inner dimensions. Your ejection distances sound about right (sticking in the grass), and the suggested 15' is a bounce distance if you are shooting on a hard surface. As for ejection path, again as long as the initial path is rearward before deflections (3:30 to 5:00), everything is OK. FYI: if your using a Old M-16 buffer (solid type, and not the current a-1 on type with the tungsten weights) your ejection path will be forward since theses buffer did not use weight (read had no dead blow effect, end of rearward travel stall). The ejection path with this buffer (really just a carrier extension) is 1:00 to 2:00. |
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Posted: 2/24/2006 9:14:53 PM EDT
[#19]
Ok now this is getting really weird. The depth of my extension is exactly 7 inches and the buffer does have a weight in it. Could the ejection port too far forward?
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Posted: 2/25/2006 1:08:35 PM EDT
[#20]
Is the upper in question a M-16 (pre A1), a SP-1, Or a C-6?
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Posted: 2/26/2006 12:13:06 PM EDT
[#21]
It's whatever the current productin Bushmaster A1 upper is. It has the brass deflector on it.
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Posted: 2/26/2006 2:53:32 PM EDT
[#22]
The upper receiver is a Canadian C-6 type/copy (A-2 features with A-1 sights), and the ejection port should be the same as an A-2.
http://www.bushmaster.com/shopping/uppers/a1ur.asp http://world.guns.ru/assault/as44-e.htm Are you sure that someone didn’t shorten the carbine buffer bumper, and this is casing the problem? |
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Posted: 2/26/2006 4:05:33 PM EDT
[#23]
That's my upper, I just bought it late last year. I'm pretty sure the buffer is ok. I bought the whole kit directly from Armalite. From the face to the end of the bumper is 3 1/8in.
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Posted: 2/26/2006 6:09:04 PM EDT
[#24]
Just double checked a few carbine buffers on hand, They are all 3-1/4".
Want to geuss what the problem is? As for a quick fix/band aid, there is allways the option of just inserting a filler plate/piece down the tube before reinstalling the recoil spring/buffer. |
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Posted: 2/26/2006 6:16:21 PM EDT
[#25]
Great! which buffer should I buy? standard carbine,heavy,h2? Who makes a good one?
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