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Posted: 5/20/2018 6:10:06 AM EST
3.75 inch 300aac Blackout Gas Operated AR15. I make the official claim as of this date to have the shortest 300blk functioning semi auto AR15. Of course with my luck someone already has one shorter. 
First test fire  3.75 inch 300blk first test fire Second Test fire  3.75 inch 300blk does it work without the suppressor?  3.75 inch 300blk unsuppressed |
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Posted: 5/20/2018 6:28:32 AM EST
Pretty cool.
Well done 
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Posted: 5/20/2018 6:37:41 AM EST
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Pretty cool. Well done 
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Posted: 5/20/2018 7:16:35 AM EST
I prefer my 6". Shown next to a 8" 5.56. Yours is pretty cool though.
What handguard do you plan on running? 
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Posted: 5/20/2018 7:18:42 AM EST
Wow that fireball. Lol
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Posted: 5/20/2018 7:24:25 AM EST
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I prefer my 6". Shown next to a 8" 5.56. Yours is pretty cool though. What handguard do you plan on running? https://farm1.staticflickr.com/910/28061796268_e4887c7823_k.jpg https://farm1.staticflickr.com/903/41888880562_3f32079b7d_k.jpg https://farm1.staticflickr.com/910/27063227677_ff9c8ede7e_k.jpg I do not know yet. It will have to be a somewhat custom handguard, or something I make myself. |
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Posted: 5/20/2018 7:25:53 AM EST
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Wow that fireball. Lol One was so you could get a decent view of the gun. The other was the singed hairs on my hands from test firing when I held it around the magwell.
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Posted: 5/20/2018 9:43:41 AM EST
cool deal! always fun to do something different.
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Posted: 5/20/2018 1:39:57 PM EST
Okay, that’s pretty bad ass
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Posted: 5/20/2018 1:43:21 PM EST
what ammo were you using? Handloads?
I have a 6.25" that I like |
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Posted: 5/20/2018 2:03:17 PM EST
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what ammo were you using? Handloads? I have a 6.25" that I like I have never fired a factory 300blk round. I need to pick some up at some point. |
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Posted: 5/20/2018 3:06:31 PM EST
Bring out the chronograph/ballistics gel for the next video and shoot some groups. It would be nice to see how practical it is vs just a silly range toy.
Does it have any hope of stabilizing the bullet with such little barrel? And assuming it does group less than 20MOA, how hard does it hit? |
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Posted: 5/20/2018 3:33:17 PM EST
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Bring out the chronograph/ballistics gel for the next video and shoot some groups. It would be nice to see how practical it is vs just a silly range toy. Does it have any hope of stabilizing the bullet with such little barrel? And assuming it does group less than 20MOA, how hard does it hit? This was not built for any real purpose other than I wanted to see if it could be done. Not really practical. I guess in theory it could make a cool PDW, but not a first choice for that. I have a few subsonic loads that I like for reliability, but as I said still got to get them on paper. I have managed to push a super load to 1300fps using the 140gr tracer. But I think I can get it faster than that. I am hoping close to 1500fps. But only testing will tell. |
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Posted: 5/21/2018 11:46:38 PM EST
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Posted: 5/21/2018 11:58:39 PM EST
Looks like there is gas coming out of the gas block. Are you bleeding some of the gas off at the gas block?
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Posted: 5/22/2018 4:06:45 AM EST
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Looks like there is gas coming out of the gas block. Are you bleeding some of the gas off at the gas block? |
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Posted: 5/22/2018 4:28:13 AM EST
Neat....but where are you going to put your vertical pistol grip?
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Posted: 5/22/2018 4:34:33 AM EST
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Neat....but where are you going to put your vertical pistol grip? I have to mill down the gas block in order to fit a handguard on it. |
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Posted: 5/22/2018 9:00:06 AM EST
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Neat....but where are you going to put your vertical pistol grip? |
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Posted: 5/22/2018 9:11:05 AM EST
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And what about the light, bipod, and BUIS? Quote HistoryQuoted:
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Neat....but where are you going to put your vertical pistol grip? |
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Posted: 5/22/2018 10:04:43 AM EST
Great, job.
I think you may be surprised on accuracy. Ron from RMW XTREME a few years ago built a DI 45 ACP with a 3.5" barrel and that one was also just to see if it would work. And every time I shoot it I am amazed at the accuracy, no it is not a precision gun but out to 40-50 yards it hits a 6" steel target 99% of the time as long as I do my part. I think as long as it is built well and you keep loads within reason bullet wise it should be good to 50yds. I would be interested in what kind of velocity you get with different loads and if you can hit 850-950 fps it should suppress well. |
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Posted: 5/22/2018 10:09:39 AM EST
Hahaha nice!
Thats a mega can too
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Posted: 5/22/2018 11:22:28 AM EST
Nice!! I just built a 7.5” one to use with a Sandman-K. Maybe I will rethink it and build shorter.
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Posted: 5/23/2018 3:10:33 PM EST
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Thats a mega can too |
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Posted: 5/23/2018 4:59:08 PM EST
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Yeah, I'm curious as to why you made the can so long. The gas block looks adjustable, so can I assume you're looking to be able to shut off the gas entirely to get crazy quiet? Quote HistoryQuoted:
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Thats a mega can too |
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Posted: 5/23/2018 5:01:15 PM EST
Quote History Quoted:
Great, job. I think you may be surprised on accuracy. Ron from RMW XTREME a few years ago built a DI 45 ACP with a 3.5" barrel and that one was also just to see if it would work. And every time I shoot it I am amazed at the accuracy, no it is not a precision gun but out to 40-50 yards it hits a 6" steel target 99% of the time as long as I do my part. I think as long as it is built well and you keep loads within reason bullet wise it should be good to 50yds. I would be interested in what kind of velocity you get with different loads and if you can hit 850-950 fps it should suppress well. As far as suppression. With a 3.75 barrel, it will have an issue getting very quiet. |
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Posted: 5/23/2018 5:42:39 PM EST
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Posted: 6/4/2018 6:16:10 PM EST
https://youtu.be/cmZSFBy9CZ8
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Posted: 6/4/2018 6:50:11 PM EST
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https://youtu.be/cmZSFBy9CZ8 |
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Posted: 6/4/2018 11:16:03 PM EST
Just thought it was relevant to the topic. Pretty cool to see the tip of the bullet.
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Posted: 6/4/2018 11:51:04 PM EST
you pronounce boolit weird.
sweet gun. looking forward to seeing what you come up with to finish the handguard. |
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Posted: 6/5/2018 3:07:47 AM EST
I would love to hear more about your tracer loads.
I asked a question about such a thing a couple years ago and got zero replays Tracer subs would be super cool. |
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