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Posted: 2/16/2020 6:08:55 PM EDT
[#1]
I'm also interested in this
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Posted: 2/16/2020 6:33:48 PM EDT
[#2]
Last time this came up here was lots of concern over baffle strikes
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Posted: 2/16/2020 6:36:08 PM EDT
[#3]
Quote HistoryQuoted:
Last time this came up here was lots of concern over baffle strikes 
I was hoping to use a conversion kit with plentiful magazines rather than buying a dedicated upper or M&P 15-22. |
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Posted: 2/16/2020 6:46:22 PM EDT
[#4]
Wasn't the issue the twist rate of the AR barrel? Something about stabilizing the 38-40 grain .22 bullet in a 5.56 barrel. I would like to know the answer to this question as well.
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Posted: 2/16/2020 7:42:15 PM EDT
[#5]
Quote HistoryQuoted:
Wasn't the issue the twist rate of the AR barrel? Something about stabilizing the 38-40 grain .22 bullet in a 5.56 barrel. I would like to know the answer to this question as well. |
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Posted: 2/16/2020 7:43:00 PM EDT
[#6]
personaly i wouldnt
you already know you want to shoot 22 from an AR host so start buyig parts when they go on sale and get that upper you really want |
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Posted: 2/16/2020 7:45:44 PM EDT
[#7]
Quote HistoryQuoted:
personaly i wouldnt you already know you want to shoot 22 from an AR host so start buyig parts when they go on sale and get that upper you really want Does such a .22 LR upper exist that can be run with the CMMG .22 LR conversion magazines? I’d rather go that direction than buying an M&P 15-22 and having to stack magazines for that. |
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Posted: 2/16/2020 8:46:56 PM EDT
[#8]
Better mag thing takes 15-22 mags for regular 22 upper
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Posted: 2/16/2020 9:12:38 PM EDT
[#9]
Quote HistoryQuoted:
Better mag thing takes 15-22 mags for regular 22 upper |
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Posted: 2/16/2020 9:50:25 PM EDT
[#10]
If you want quiet suppressed a 16” rimfire barrel requires subsonic or standard velocity 22LR. A pistol lower or SBR is worth it unless you need to put the smack down on critters
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Posted: 2/16/2020 10:46:47 PM EDT
[#11]
Quote HistoryQuoted:
Valid point. Does such a .22 LR upper exist that can be run with the CMMG .22 LR conversion magazines? I’d rather go that direction than buying an M&P 15-22 and having to stack magazines for that. Quote HistoryQuoted:
Quoted:
personaly i wouldnt you already know you want to shoot 22 from an AR host so start buyig parts when they go on sale and get that upper you really want Does such a .22 LR upper exist that can be run with the CMMG .22 LR conversion magazines? I’d rather go that direction than buying an M&P 15-22 and having to stack magazines for that. |
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Posted: 2/16/2020 11:11:13 PM EDT
[#12]
Plenty of M16 owners use suppressors on their .22 conversions with no problems.
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Posted: 2/16/2020 11:37:00 PM EDT
[#13]
Isnt a .22lr bore only .002” tighter than .223 spec? Also i dont see how the faster twist would destabilize a bullet so bad it would cause a baffle strike.
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Posted: 2/16/2020 11:42:22 PM EDT
[#14]
I have a 10 1/2" upper PSA brand that I use with a Franklin Armory binary trigger equipped lower have used the Sparrow and a Checkmate both work great. Side note try the Blackdog 50 Rd drum
 . This is with the CMMG conversion kit
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Posted: 2/16/2020 11:44:30 PM EDT
[#15]
Quote HistoryQuoted:
I have a 10 1/2" upper PSA brand that I use with a Franklin Armory binary trigger equipped lower have used the Sparrow and a Checkmate both work great. Side note try the Blackdog 50 Rd drum Is the 10.5” upper from PSA a dedicated .22 LR or a 5.56 with a conversion kit? |
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Posted: 2/16/2020 11:47:36 PM EDT
[#16]
It's a standard 556 upper... I think I paid less than $200.00 for it. I'll make a video next weekend doing a mag dump. It's useless but HUGE fun
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Posted: 2/17/2020 1:00:49 AM EDT
[#17]
Quote HistoryQuoted:
It's a standard 556 upper... I think I paid less than $200.00 for it. I'll make a video next weekend doing a mag dump. It's useless but HUGE fun  Here's mine in action.
 Dead Air Mask HD with Franklin Binary Trigger OP totally worth getting the parts for a dedicated upper. If you don't want to build it yourself RTB is a great resource for all things CMMG .22lr related as you've discovered and they have some good turn key options. I prefer the Blackdog magazines compared to the CMMG ones but either will serve your needs. The only downside is there is no working bolt hold open. Of course if you get the dedicated upper and bolt combo you can still buy the .223 chamber adapter al a carte and use the bolt by removing the dedicated barrel collar and and replacing it with the chamber adpater if you wanted on any .223 upper of your choice. Something to think about. I have one but to be honest once I had a couple of dedicated barrels I rarely utilize it any more.  
 
The first 3 pictures are of the same 16 inch barrel. When I get bored I play around with the crap in my spare parts bin sometimes and get creative with it. The last picture is a 4 inch barrel. That thing is a ton of fun. |
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Posted: 2/17/2020 8:28:12 AM EDT
[#18]
+1 for a dedicated upper. I go CMMG and then use the Catch 22 bolt catch which allows you to run MP15-22 mags in a standard AR lower.
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Posted: 2/17/2020 8:55:22 AM EDT
[#19]
Quote HistoryQuoted:
Plenty of M16 owners use suppressors on their .22 conversions with no problems. I shoot an old 20" Colt SP1 upper along with an AR15 barrel I cut down to 7.5" on my RR with a Bowers CAC22 can. The gas system has been removed on both uppers. The only problem is cleaning the lead filled can, no baffle damage to date. |
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Posted: 2/17/2020 8:58:09 AM EDT
[#20]
Quote HistoryQuoted:
I'm one of those guys. I shoot an old 20" Colt SP1 upper along with an AR15 barrel I cut down to 7.5" on my RR with a Bowers CAC22 can. The gas system has been removed on both uppers. The only problem is cleaning the lead filled can, no baffle damage to date. |
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Posted: 2/17/2020 6:40:09 PM EDT
[#21]
My shits and giggles kit. It's also impressive unsuppressed
 Attached File |
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Posted: 2/19/2020 8:25:39 PM EDT
[#22]
Bump for more input.
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Posted: 2/19/2020 9:45:52 PM EDT
[#23]
Quote HistoryQuoted:
Bump for more input. |
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Posted: 2/19/2020 9:49:29 PM EDT
[#24]
OP, this same question was asked in the Griffin industry thread here.
Green0 replied and said there wouldn’t be any problems with shooting using a conversion kit. I have a conversion kit, CMMG, that I have dedicated to a 1:9 twist barrel. I am in the market for a hybrid can to shoot with this setup... probably the Bushwacker46. If your bullets stabilize and don’t keyhole, I’d see no problem either. |
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Posted: 2/19/2020 9:59:19 PM EDT
[#25]
Quote HistoryQuoted:
OP, this same question was asked in the Griffin industry thread here. Green0 replied and said there wouldn’t be any problems with shooting using a conversion kit. I have a conversion kit, CMMG, that I have dedicated to a 1:9 twist barrel. I am in the market for a hybrid can to shoot with this setup... probably the Bushwacker46. If your bullets stabilize and don’t keyhole, I’d see no problem either. |
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Posted: 2/19/2020 10:15:17 PM EDT
[#26]
I am glad I saw this thread.
I have been running a CMMG bravo for awhile now on a PSA 7.5" 556 upper. Its been great with the blackdog sonic welded mags. I have a Halcyon coming someday so I decided to buy a RTB 9" dedicated 22lr barrel. I haven't shot it yet but looks good to go. RTB had their barrel collar for $40 and the barrel was $90. Their upper kits are very nicely priced in my opinion. I just wanted to build my own. I guess I should contact AAC about using the can on a converted 556 barrel for future reference. |
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Posted: 2/19/2020 10:31:44 PM EDT
[#27]
I think about waiting for the RTB complete uppers to come back in stock and just going that route. Looks like they will work with a standard AR lower and CMMG pattern .22 LR magazines?
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Posted: 2/20/2020 12:11:29 AM EDT
[#28]
I’ll be the dissenter. Somewhat at least. I shoot a lot of full auto 22lr. Just be careful of the ammo you use. I had an an OOB round lodge chunks in the barrel. The next ones must have smacked it into the baffles. No way you let off fast enough. Took a while to piece it together. Can on was broadside of barn after that.
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Posted: 2/21/2020 10:05:05 AM EDT
[#29]
I built a .22 upper with the same rail and upper as my. 300blk as a training tool. I got a CMMG 4.5" .22 barrel and bolt kit, a Better Mag Adapter to use S&W M&P 15-22 mags, and a Sparrow to snake under a 7" Larue rail. I have around 3k rounds through the upper with nothing more than the usual .22 misfires. I'd say it's one of the more fun and interesting uppers I've ever used, and I take it to the range all the time.
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Posted: 2/21/2020 12:07:56 PM EDT
[#30]
I've had no problems with a 22 can on a 1/12 rifle length 556 barrel with a CMMG kit.
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Posted: 2/21/2020 2:15:30 PM EDT
[#31]
Quote HistoryQuoted:
I've had no problems with a 22 can on a 1/12 rifle length 556 barrel with a CMMG kit. |
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Posted: 2/21/2020 11:08:55 PM EDT
[#32]
Quote HistoryQuoted:
I think about waiting for the RTB complete uppers to come back in stock and just going that route. Looks like they will work with a standard AR lower and CMMG pattern .22 LR magazines? Yeah it'll fit a standard lower. RTB just uses rebranded CMMG bolts and barrels. My Black Dog mags have been great, but the S&W mags + Redi Mag adapter is popular |
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Posted: 2/21/2020 11:11:07 PM EDT
[#33]
Appreciate all of the good input here.
RTB has been out of stock on the dedicated .22 LR upper that I have my eye on. Palmetto State told me they don’t have any timeline on when there’s will be back in stock either. Dang it! |
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Posted: 2/21/2020 11:44:06 PM EDT
[#34]
Quote HistoryQuoted:
Better mag thing takes 15-22 mags for regular 22 upper and my .22 ar build is my most fun and most shot gun recently |
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Posted: 2/24/2020 12:17:12 PM EDT
[#35]
Quote HistoryQuoted: Seems tough enough these days finding a 1/9 twist. Where did you find a 1/12? Sounds pretty cool. |
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Posted: 2/24/2020 12:50:24 PM EDT
[#36]
Retro guns are often 1/12
Try googling about retro barrels |
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Posted: 2/24/2020 3:21:14 PM EDT
[#37]
My 20” A2 upper is 1/12. It works great with the conversion bolt. I still like my dedicated 22 upper better.
ETA: It’s retro like Brad said, triangle handgaurd n all. |
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