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Posted: 4/21/2020 11:17:29 PM EDT
[#1]
Yeah I mean it has the rear cutout like the Colt SOCOM M4 barrel, but it's missing the front step down barrel cut for the M203 mount. Probably because it's too short... Might be able to rig something up with a special extension maybe? Probably better off with a rail mount for such a short barrel. Or you might be able to get a 14.5" SOCOM barrel and chop it down to 12.5" or something and still retain the front step down cut.
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Posted: 4/21/2020 11:24:03 PM EDT
[#2]
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Posted: 4/22/2020 6:46:09 AM EDT
[#3]
Unless you fabricate a custom offset mount, it won't work.
EDIT: On the other hand, you might be able to take the old style mount and run it over your muzzle device. But how secure or how long that would hold up would be uncertain. |
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Posted: 4/22/2020 7:41:04 AM EDT
[#4]
If you want 11.5" bbl and m203, you want to rail mount it. Mine:
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Posted: 4/22/2020 7:22:26 PM EDT
[#5]
Thanks guys. Thats such a dissappointment and im not into buying another m203.
Would have been really neat though. |
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Posted: 4/22/2020 8:49:52 PM EDT
[#6]
Quote HistoryQuoted: Thanks guys. Thats such a dissappointment and im not into buying another m203. Would have been really neat though. I might try one of those 5.5” flash hiders, getting it turned down to mimic the step down on the barrel to keep pressure on the m203 bracket. |
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Posted: 4/23/2020 11:56:12 AM EDT
[#7]
Quote HistoryQuoted: Thanks guys. Thats such a dissappointment and im not into buying another m203. Would have been really neat though. It can’t be that expensive to just get a 16” PSA upper chopped to like 12.5” Presuming that’s not what you want tho... |
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Posted: 4/23/2020 12:14:36 PM EDT
[#8]
A buddy has a 203 and a short barrel upper and needed something. Here's what I came up with. Slides over the FH and bolts to the 203 receiver. There's a leg that goes behind the bayonet lug to keep the whole thing from sliding forward. He said that Chris Kyle's unit had these and called them Ramadi Doorkickers.
 Attached File |
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Posted: 4/23/2020 12:29:04 PM EDT
[#9]
Quote HistoryQuoted: A buddy has a 203 and a short barrel upper and needed something. Here's what I came up with. Slides over the FH and bolts to the 203 receiver. There's a leg that goes behind the bayonet lug to keep the whole thing from sliding forward. He said that Chris Kyle's unit had these and called them Ramadi Doorkickers. https://www.AR15.Com/media/mediaFiles/72316/IMG_20190517_164956_794_jpg-1382256.JPG https://scontent.fhou1-1.fna.fbcdn.net/v/t1.0-9/60443520_2112482028799063_5817182926374174720_o.jpg?_nc_cat=106&_nc_sid=8024bb&_nc_ohc=5BulOxLYd9YAX9OOoNI&_nc_ht=scontent.fhou1-1.fna&oh=39799bad3cff42293d8f6ebe15848294&oe=5EC6CC9B  Did you consider cutting slots in your adapter to match the flash suppressor and allow gas to escape? |
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Posted: 4/23/2020 12:36:01 PM EDT
[#10]
I have seen stuff like this, without the cuts so I just did it like that. Hes shot it and says it works well and surprisingly doesn't get hot.
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Posted: 4/23/2020 12:56:46 PM EDT
[#11]
I won't swear on it but it's been done:
 I think the Griffin is going to be very, very close. |
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Posted: 4/23/2020 1:27:47 PM EDT
[#12]
So how short can you actually go on a barrel mounted 203 without these whizbang tricks? 12? 12.5”?
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Posted: 4/23/2020 1:46:19 PM EDT
[#13]
Quote HistoryQuoted: So how short can you actually go on a barrel mounted 203 without these whizbang tricks? 12? 12.5"? If you want a QD silencer it'll need clearance for the M203 QD mount. Running a non-QD M203 mount (the old simple bracket) would get you a fraction of an inch shorter. If you don't want a can, you could literally use a flash suppressor as the stop for M203 mounting. https://www.ar15.com/forums/AR-15/Anyone-ever-cut-an-M4A1-barrel-to-13-/118-724595/#i7647135 @DontBuryMe pic from above thread:  Attached File |
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Posted: 4/24/2020 8:19:08 PM EDT
[#14]
That is the most beautiful thing ive seen in a long time. If u ever decide to fabricate more im down to buy a set for my mk18s
Now where are those cheap dsa receivers.. Quote HistoryQuoted: A buddy has a 203 and a short barrel upper and needed something. Here's what I came up with. Slides over the FH and bolts to the 203 receiver. There's a leg that goes behind the bayonet lug to keep the whole thing from sliding forward. He said that Chris Kyle's unit had these and called them Ramadi Doorkickers. https://www.AR15.Com/media/mediaFiles/72316/IMG_20190517_164956_794_jpg-1382256.JPG https://scontent.fhou1-1.fna.fbcdn.net/v/t1.0-9/60443520_2112482028799063_5817182926374174720_o.jpg?_nc_cat=106&_nc_sid=8024bb&_nc_ohc=5BulOxLYd9YAX9OOoNI&_nc_ht=scontent.fhou1-1.fna&oh=39799bad3cff42293d8f6ebe15848294&oe=5EC6CC9B |
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Posted: 4/24/2020 10:51:23 PM EDT
[#15]
Quote HistoryQuoted: That is the most beautiful thing ive seen in a long time. If u ever decide to fabricate more im down to buy a set for my mk18s Now where are those cheap dsa receivers.. No problem building more mounts but I'm horrible about writing down dimensions when I make stuff. I do so much one off stuff between firearms and paintball, I should know better. I'd need a upper and a 203 but more could be made. |
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Posted: 5/2/2020 1:59:17 PM EDT
[#16]
12.5 is where it's at, no modifications necessary other than cutting down a M4 barrel and rethreading the muzzle.
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Posted: 6/1/2020 4:16:52 PM EDT
[#17]
I, like an idiot, wanted to do a retro carbine clone at the same time I did my M203. I wish I cut it to 12.5'' instead. I may get a brownells barrel instead to do an "IDF" clone. You can get a standard mount to fit on the grooves in the flash hider with the correct number of shims.
ETA: Will an LMT QD mount work with a lightweight barrel? I guess I'm wording it could slide around without an M4 notch.  Attached File |
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Posted: 6/20/2020 11:32:56 PM EDT
[#18]
It will mount to a 11.5 with the Vietnam Style moderator. Check the retro forum for details
@jsbsmarine @couch-commando  Attached File |
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Posted: 6/21/2020 1:39:49 AM EDT
[#19]
Quote HistoryQuoted: It will mount to a 11.5 with the Vietnam Style moderator. Check the retro forum for details @jsbsmarine @couch-commando https://www.AR15.Com/media/mediaFiles/275279/D21E69B6-A4E1-4D97-9E67-0484607161F0_jpe-1470214.JPG Care to elaborate? |
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Posted: 6/21/2020 9:31:51 AM EDT
[#20]
The moderator is a Vietnam era large flash-hider that is actually considered a suppressor by the atf. But many repros are out they and pinned/welded to the barrel to make them 16"
Looks like they used a moderator style fh in the pictures with the old standard non-qd style m203 barrel clamp I wonder if it engages any grooves or just relies on friction to keep if from sliding back |
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Posted: 6/21/2020 10:04:32 AM EDT
[#21]
Quote HistoryQuoted: Looks like they used a moderator style fh in the pictures with the old standard non-qd style m203 barrel clamp I wonder if it engages any grooves or just relies on friction to keep if from sliding back |
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Posted: 7/26/2020 6:32:40 PM EDT
[#22]
Quote HistoryQuoted: It will mount to a 11.5 with the Vietnam Style moderator. Check the retro forum for details @jsbsmarine @couch-commando https://www.AR15.Com/media/mediaFiles/275279/D21E69B6-A4E1-4D97-9E67-0484607161F0_jpe-1470214.JPG Will the muzzle blast damage the end of the 40mm barrel? |
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Posted: 7/30/2020 10:06:25 AM EDT
[#23]
Quote HistoryQuoted: Will the muzzle blast damage the end of the 40mm barrel? Have you ever seen the tops of the aluminum lights on LE used MP5s that run the Surefire forearms? They get so blasted and carboned up it's practically impossible to get off. I'm sure the muzzle blast from 5.56 will be considerably worse on the top of a 203 barrel. |
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Posted: 7/30/2020 5:00:15 PM EDT
[#24]
Quote HistoryQuoted: Have you ever seen the tops of the aluminum lights on LE used MP5s that run the Surefire forearms? They get so blasted and carboned up it's practically impossible to get off. I'm sure the muzzle blast from 5.56 will be considerably worse on the top of a 203 barrel. Quote HistoryQuoted: Quoted: Will the muzzle blast damage the end of the 40mm barrel? Have you ever seen the tops of the aluminum lights on LE used MP5s that run the Surefire forearms? They get so blasted and carboned up it's practically impossible to get off. I'm sure the muzzle blast from 5.56 will be considerably worse on the top of a 203 barrel. That’s why I’m asking.  I see IDF weapons with muzzles almost matching. |
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Posted: 7/30/2020 6:39:58 PM EDT
[#25]
An A2 flashhider doesn't direct any blast downward. So it protects the barrel
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