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Posted: 5/23/2020 6:53:36 PM EDT
[#1]
Skip the CMMG mags and get either a Catch-22 (since you are dedicating a lower to it) or a Boonie Packer BetterMag adapter. This will allow you to use much better S&W M&P15-22 magazines.
I do fine with a standard AR charging handle. There are rare cases (I'm talking 1 in 500 rounds) where an extracted shell gets up and into the gas tube hole in the standard AR. Some fill the hole with JB Weld or similar but I just live with it since it happens so rarely. Otherwise it looks good. Put a suppressor on it and it's going to be BLAST! |
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Posted: 5/23/2020 8:18:40 PM EDT
[#2]
Not sure about the rail length and barrel length. Is the rail large enough for a can to fit inside?
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Posted: 5/23/2020 8:24:11 PM EDT
[#3]
Quote HistoryQuoted: Not sure about the rail length and barrel length. Is the rail large enough for a can to fit inside? Most any 22lr can is smaller than the diameter of an AR barrel nut so it would be really extraordinary for that to be a problem on a 22. |
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Posted: 5/23/2020 8:51:43 PM EDT
[#4]
Quote HistoryQuoted: Skip the CMMG mags and get either a Catch-22 (since you are dedicating a lower to it) or a Boonie Packer BetterMag adapter. This will allow you to use much better S&W M&P15-22 magazines. I do fine with a standard AR charging handle. There are rare cases (I'm talking 1 in 500 rounds) where an extracted shell gets up and into the gas tube hole in the standard AR. Some fill the hole with JB Weld or similar but I just live with it since it happens so rarely. Otherwise it looks good. Put a suppressor on it and it's going to be BLAST! Yep I was going to come in here and recommend the Boonie Packer. I just got the kit earlier this week after having it on backorder. The website recently got their inventory back in stock, so now is the time to order. Let me just say it made my AR that much more fun to shoot. I'm just so happy with this little kit. https://www.redi-mag.com/product/better-mag-s-22-rimfire-magazine-adaptor/ All you need is S&W magazines and you're good to go as far as having bolt stop function. I have been using the CMMG magazines for a few years but always wanted to have a functional bolt stop. This has provided me with that and I'm not sure why I didn't do it years ago. |
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Posted: 5/23/2020 9:03:39 PM EDT
[#5]
Would a Catch-22 bolt release do the same thing? I've already got the three CMMG magazines that came with the bolt kit and hadn't planned on buying more unless these don't work.
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Posted: 5/23/2020 10:15:51 PM EDT
[#6]
Quote HistoryQuoted: Would a Catch-22 bolt release do the same thing? I've already got the three CMMG magazines that came with the bolt kit and hadn't planned on buying more unless these don't work. This is from RTB website: Magazine compatibility: For the bolt catch to provide true last-round-hold-open, the magazine that is used needs to have a follower that sticks out of the back and will engage the bolt catch after the last round. Because of this, different magazines will offer different last round functionality. CMMG / Black Dog "Standard" (X-form, Sonic Weld, etc.): These magazines have a follower that sticks up after the last round is fired, but it doesn't reach out of thee back which is required to hit the bolt catch. The bolt catch will need to be manually engaged to hold the bolt back after the magazine is removed. https://www.righttobear.com/Catch22-Bolt-Catch-for-22LR-p/catch22.htm |
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Posted: 5/24/2020 12:31:57 AM EDT
[#7]
CMMG mags, all that I have tried suck
I prefer Blackdog mags all mine have reliable last round bolt hold open. I have used S&W 1522 mags and mag adapter they work but IMO less parts is better Get a CMMG 22 LR charging handle. Also a pressure plug, I have taccom3g's but I don't think they are available anymore, I think a member here AR15 was making and selling them. Any standard lower works, pick your roll mark I have two dedicated AR 22's, one pistol 4" barrel and rifle with 17" ultra light barrel both on top of 80% lowers |
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Posted: 5/24/2020 12:44:51 AM EDT
[#8]
Might keep an extra extractor and spring on hand.
I have a Franklin BFSIII binary trigger on my pistol, seems like every few thousand rounds it eats an extractor. My rifle I run a CMC 3.5# trigger |
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Posted: 5/24/2020 7:39:37 AM EDT
[#9]
If you want to save a couple $$s on a flash hider you can make something like I did. I had a couple 1/2 to 3/4 adapters laying around that screwed on the end of the barrel. 3/4 EMT conduit fits loosely over the adapter. I JB welded the conduit to the adapter then put a wrap of masking tape around it so the epoxy wouldn’t ooze out. Install it on the upper, slip hand guard on, then use earplugs as spacers at the muzzle end to center it up while the JB weld sets up.
 Attached File |
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Posted: 5/24/2020 10:18:08 AM EDT
[#10]
OP. Welcome to the forums. You have a solid build in mind and should be good to go. I love my super shorty .22 upper. We've run it hard with a Franklin BFS3 trigger. Plan to suppress yours at some point. It's totally worth it. With that bbl length it keeps the bulk .22 stuff subsonic without the need to have to buy standard velocity or subsonic labeled ammo specifically.
Here is a video of mine in action.  22AR with Dead Air Mask, Franklin Armory BFS3, Bore Buddy accessory upgrades. As you can see with the CMMG or Black Dog magazines you have to run the charging handle after swapping each mag. With that catch 22 and S&W mag adapter they are talking about you retain the functionality of your typical bolt catch. Mine is just a fun range toy so I've never felt the need to go that route but if your building this for training purposes to mimic it's centerfire cousin it would be worth considering. |
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Posted: 5/24/2020 6:47:30 PM EDT
[#11]
Thanks all. I'll get the better mag adapter on my next build. This is just going to be a plinker.
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Posted: 5/24/2020 8:09:47 PM EDT
[#12]
if the cmmg bolt kit runs as well as the 22lr banshee youre going to love it. im about 500 rnds in with no malfunctions (CCI SV, CCI AR tactical, CCI MiniMag).
get lower parts kit from forward controls designs. free shipping if you only get the springs and detents. |
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Posted: 5/24/2020 9:10:40 PM EDT
[#13]
Quote HistoryQuoted: Thanks all. I'll get the better mag adapter on my next build. This is just going to be a plinker. Stick to the Blackdog mags over the CMMG ones. I have a few and almost never take them along compared to my Blackdog mags. The pressure plug is a good accessory. RTB or BoreBuddy is where to find one. I don't think TACCOM offers it any more. |
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Posted: 5/24/2020 11:12:20 PM EDT
[#14]
I may be wrong and it wouldnt be the first time. One thing I saw you mention was a collar for the barrel. If you are picking up the CMMG 22lr bcg, that will already have the collar on the front of it. It's part of the bcg so you should not need one for the barrel.
Oooops, never mind. It looks like the CMMG with 3 mags is a conversion bcg instead of a dedicated bcg. In that case, the collar is needed. However, I see no reason why you couldnt go with the RTB dedicated BCG and 4.5" barrel combo. Then just buy whatever mags you want. I have both CMMG bcgs and recently a RTB 22lr bcg and I really cant see any difference in quality, JMHO. |
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Posted: 5/24/2020 11:35:03 PM EDT
[#15]
Quote HistoryQuoted: I may be wrong and it wouldnt be the first time. One thing I saw you mention was a collar for the barrel. If you are picking up the CMMG 22lr bcg, that will already have the collar on the front of it. It's part of the bcg so you should not need one for the barrel. Oooops, never mind. It looks like the CMMG with 3 mags is a conversion bcg instead of a dedicated bcg. In that case, the collar is needed. However, I see no reason why you couldnt go with the RTB dedicated BCG and 4.5" barrel combo. Then just buy whatever mags you want. I have both CMMG bcgs and recently a RTB 22lr bcg and I really cant see any difference in quality, JMHO. |
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Posted: 5/25/2020 12:15:21 AM EDT
[#16]
Welcome to ARFCOM, OP. Built a left-eject .22 for the kiddo. Looks like a good build.
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Posted: 5/25/2020 11:21:31 AM EDT
[#17]
Quote HistoryQuoted: I may be wrong and it wouldnt be the first time. One thing I saw you mention was a collar for the barrel. If you are picking up the CMMG 22lr bcg, that will already have the collar on the front of it. It's part of the bcg so you should not need one for the barrel. Oooops, never mind. It looks like the CMMG with 3 mags is a conversion bcg instead of a dedicated bcg. In that case, the collar is needed. However, I see no reason why you couldnt go with the RTB dedicated BCG and 4.5" barrel combo. Then just buy whatever mags you want. I have both CMMG bcgs and recently a RTB 22lr bcg and I really cant see any difference in quality, JMHO. Yes the kit I got was the CMMG conversion with three mags because was on sale. I did buy the RTB collar, barrel and upper when they went on sale this weekend. I spent about the same amount of money as the bolt/barrel kit deal which was sold out. |
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Posted: 5/29/2020 1:50:15 PM EDT
[#18]
Quick question, do you need a crush washer for the flash hider? I have a Guntech 5.5 inch flash hider but it did not come with a crush washer. The manufacturer said "it is recommended but not required". So do I need one or not? It is going on an RTB 4.5 inch barrel.
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Posted: 5/29/2020 3:23:56 PM EDT
[#19]
Quote HistoryQuoted: Quick question, do you need a crush washer for the flash hider? I have a Guntech 5.5 inch flash hider but it did not come with a crush washer. The manufacturer said "it is recommended but not required". So do I need one or not? It is going on an RTB 4.5 inch barrel. |
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Posted: 5/29/2020 4:58:30 PM EDT
[#20]
Quote HistoryQuoted: The use of a crush washer is so that you can time the flash hider AKA make sure the openings are set correctly. I used a Kak Micro slim flash can on my 4.5" 22 barrel and did not use a crush washer since the was no need to time it. Ok that make sense. I'm guessing hand tight or apply a little grunt with a strap wrench? There isn't a flat spot for a combination wrench. |
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Posted: 5/29/2020 8:40:01 PM EDT
[#21]
Use a strap wrench. You are going to want it more than just hand tight.
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Posted: 7/8/2020 11:05:19 PM EDT
[#22]
Well I got it built just before July 4th and it works great. It is going to be even more fun when I get a can. Thanks for all the advice.
.22 Build The final build list: RTB 9mm/.22 upper Aero M4E1 lower PSA EPT trigger Aero LPK no FCG/trigger guard Catch-22 bolt catch RTB 4.5 inch barrel and collar CMMG bolt kit w/ 3 mags Guntech 5.5 flash hider Matrix Arms Foxtrot 7 inch rail IWC barrier hand stop Spikes Tactical charging handle. KNS Precision stock adapter with flange SB Tactical FS1913 (plastic strut, I have an aluminum one on backorder) FAB Defense folding sights |
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