Posted: 11/20/2024 7:03:11 PM EDT
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I know Colt just licenses these kits, possibly a CMMG? mags look the same as does the bolt/carrier with the Colt having a blacked out portion. Anyone own/use one and report how they function? I've read good and bad on them just ordered one so I'm curious. https://coltparts.com/colt-22lr-drop-in-bolt-conversion-kit-for-ar15-w-3x-25-round-magazines/ |
I shot an AR15 with the CMMG conversion kit installed. The results were disappointing to say the least. I started off with two 25rd magazines full of Aguila Super Extra HV 40gr copper plated. This ammunition runs reliably in all my other semiauto 22LR's. The were 11 failures to eject out of the 50rds fired. I then fired one 25rd magazine of CCI Quiet-22 Semiauto lead. There was one failure to eject and the bolt locked back once before it was empty. Finally, thinking that it might require 22LR with more power, I fired one 25rd magazine of CCI Velocitor 40gr copper plated hollow points. There were five failures to eject. Of all these failures to eject, the majority were easy to clear, but a good number required the bolt to be removed in order to clear the jam because the mechanism was catching and holding the spend case.       |
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The Colt and CMMG are NOT the same, and they are NOT made by CMMG, there are slight difference and the biggest being the DLC finish. All conversion devices are temperamental with ammunition, the copper plated ammo works reliably, generally, and applying a little oil on the hammer/trigger region may solve alot of issues. |
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You should probably buy one of these. I did, and mine works pretty good. Bore buddy plug |
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Originally Posted By Sorry_Your_Girl_Lost: You should probably buy one of these. I did, and mine works pretty good. Bore buddy plug Not needed if the upper is assembled properly from in spec parts. I've had a stainless steel CMMG conversion kit since April, 2010 and I don't use any aftermarket add-ons. I've used the conversion assembly in at least eight different 5.56/.223 Rem uppers and with at least five different lowers. Good ammo and good mags are the keys to reliable operation. The conversions were designed using Federal 36 gr., copper coated, round nose ammo. Using that and CCI MiniMag and AR-Tactical, 40 gr. I've had reliable operation. Empties into the charge handle have been generally due to worn mag lips releasing rounds prematurely. MHO, YMMV, etc. |
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Find a m261 .22 conversion unit. Either the inserts or the BD mags work fine. That looks nothing like my Colt conversion unit of old. Only real issue with that is that the mags have the ejector on it and the mags are hard to find. |
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I'm getting down to the last box, the others have all been destroyed...
I'm getting down to the last box, the others have all been destroyed...
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I been seeing these kits a lot lately, Cmmg and Colt. I'm tapped out on gun funds but I should grab one soon. I haven't shot my 10/22 in years but been thinking about dusting it off and maybe refurbish it. I just assumed these kits were unreliable because I never see people with them or hear about them. Is the Colt and cmmg the same system and mags? |
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| I had a thought about the Bushmaster SBR that I used, so I decided to test my theory today. The Bushmaster SBR has a commercial buffer tube. My thought was that perhaps the conversion kit doesn't work reliably with rifles that have commercial buffer tubes for some reason. So, I decided to break out my CMMG 10.3" SBR. It's not technically a "factory" SBR, but I bought the complete lower from them, did the NFA thing, bought a complete upper from them and then snapped them together. I figured that I'd use the CMMG rifle to eliminate an excuse option for them if I had to call. I installed the conversion bolt in the CMMG and then loaded up a magazine with 25rds of Aguila Super Extra HV 40gr copper plated. It ran flawlessly. Unlike when I was using the Bushmaster, the cycling felt the same every shot. I then loaded up three more magazines with 25rds of Aguila Super Extra HV 40gr copper plated. Function was once again 100% through all three magazines. Obviously, I'd have to do a lot more testing of commercial versus milspec buffered AR15's to test my theory, but it's obvious at this point that there is something different in the Bushmaster that's causing the ejection failures. Before anyone thinks that perhaps the Bushmaster is just an unreliable rifle, it isn't. I've put hundreds of rounds through it without issue. In fact, I put its BCG back in and shot some without issue after using the 22LR conversion kit to clear things out. It runs like a champ using 223Rem or 5.56x45 ammunition. |
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I put a several thousand rounds of .22 through an old Ceiner conversion kit in my 6520 Government Carbine over a few years. I got the barrel chopped to 14.5 and the gunsmith had a hell of a time getting the front sight base off. The Gas Port was clogged with lead form all the .22s to the point it wouldn't have functioned with center fire rounds. The supposed solution to this is to shoot some 5.56 every couple of hundred rounds of .22 to blow the lead out, but I built a dedicated .22lr upper instead. |
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Originally Posted By Bret: I had a thought about the Bushmaster SBR that I used, so I decided to test my theory today. The Bushmaster SBR has a commercial buffer tube. My thought was that perhaps the conversion kit doesn't work reliably with rifles that have commercial buffer tubes for some reason. So, I decided to break out my CMMG 10.3" SBR. It's not technically a "factory" SBR, but I bought the complete lower from them, did the NFA thing, bought a complete upper from them and then snapped them together. I figured that I'd use the CMMG rifle to eliminate an excuse option for them if I had to call. I installed the conversion bolt in the CMMG and then loaded up a magazine with 25rds of Aguila Super Extra HV 40gr copper plated. It ran flawlessly. Unlike when I was using the Bushmaster, the cycling felt the same every shot. I then loaded up three more magazines with 25rds of Aguila Super Extra HV 40gr copper plated. Function was once again 100% through all three magazines. Obviously, I'd have to do a lot more testing of commercial versus milspec buffered AR15's to test my theory, but it's obvious at this point that there is something different in the Bushmaster that's causing the ejection failures. Before anyone thinks that perhaps the Bushmaster is just an unreliable rifle, it isn't. I've put hundreds of rounds through it without issue. In fact, I put its BCG back in and shot some without issue after using the 22LR conversion kit to clear things out. It runs like a champ using 223Rem or 5.56x45 ammunition. The buffer tube type (i.e., commercial or mil spec) has nothing to do with the .22LR conversion function. There is a lug (or tab) at the top of the frame back plate with a hole in it where the small rod end of the recoil spring rod fits. That tab rests against the lower and prevents the .22LR assembly from moving backwards. In any case, I am one of thousands of individuals who have an AR lower used for .22LR shooting that does not even have any buffer tube. So when you see someone suggests using a "pressure plug" to fix poor operation, ask them what someone who does not have a buffer tube is supposed to do. You'll get total silence. FWIW, the back of the frame rear plate at the top should be flush with the rear of the lower receiver under the charge handle. If the back of the frame plate is recessed into the lower, the frame assembly is insecure and stands the chance of improper operation. I suggest that the cause of the conversion assembly being recessed be investigated and corrected for proper operation. MHO, YMMV, etc. |
| I decided to give the 22LR conversion kit the ultimate test by running it in my Colt M16. I had to buy a sear trip kit which arrived Christmas Eve. It was easy to install. I fired seven 25rd magazines of Aguila Super Extra HV 40gr copper plated and one 25rd magazine of CCI Velocitor 40gr copper plated hollow point. The Aguila experienced one failure to feed caused by a short stroke and one failure to fire caused by the trigger not resetting. Overall, pretty decent but not perfect. The CCI Velocitor had three ejection jams caused by the spent cases getting caught in the action of the bolt. I think the CCI Velocitor simply cycled too fast for the system. As you can imagine, it was easy to keep the sight I was using on target due to the lack of recoil. I'm going to get my wife and daughter to give it a run as neither have fired a machinegun. |
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Originally Posted By Bret: I decided to give the 22LR conversion kit the ultimate test by running it in my Colt M16. I had to buy a sear trip kit which arrived Christmas Eve. It was easy to install. I fired seven 25rd magazines of Aguila Super Extra HV 40gr copper plated and one 25rd magazine of CCI Velocitor 40gr copper plated hollow point. The Aguila experienced one failure to feed caused by a short stroke and one failure to fire caused by the trigger not resetting. Overall, pretty decent but not perfect. The CCI Velocitor had three ejection jams caused by the spent cases getting caught in the action of the bolt. I think the CCI Velocitor simply cycled too fast for the system. As you can imagine, it was easy to keep the sight I was using on target due to the lack of recoil. I'm going to get my wife and daughter to give it a run as neither have fired a machinegun. Thanks for posting your experience. The sear trip kit that CMMG now sells (apparently has sold since sometime in 2023) has an anti-bounce weight (ABW) that weighs about 1.25 oz. which is about 1/2 oz. heavier than their previous ABW, so I expect that it will be more reliable with high velocity ammo in uppers that have 8 in. and longer barrels. And the CMMG ABW has the forward assist feature which can be used to ensure that the first round is fully chambered. I found the Colt conversion unit recoil spring a bit "stiff", so I've hand cycled the conversion while watching tv (holding the bolt/recoil assembly in one hand and pushing the back of the frame with the other hand) 1,500 or so times to soften/smooth it somewhat. One can do about 70 strokes a minute, so it takes less than half an hour. MHO, YMMV, etc. |