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Old September 22, 2012, 08:26 PM   #1
1911steelplate
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ar 15 22lr conversion

I'm thinkn about tryn the 22lr conversion on my ar.Does anyone have info about this. I know the 22lr barrels are different rate of twists compared to the ar, so I know it's not going to be great for targeting but how about the jams and feed problems if any.
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Old September 22, 2012, 10:24 PM   #2
Ridge_Runner_5
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I used a drop in conversion. No barrel. Just the .22 bolt and an adapter for it to reach past the chamber into the bore.

Shot accurately enough. CMMG is the best option. Get the chrome plated version. Much easier to clean. They also have another adapter that allows you to use the bolt hold with it.
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Old September 23, 2012, 01:46 AM   #3
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Yes a shameless plug for CMMG. I just got a complete upper from them, excelent product and service and fun. I decided on a dedicated upper because I had tried a cousins action assembly and it jammed so much it wasn't worth shooting and not accurate. I don't know about the CMMG .22 action aasembly, but their other products are first rate.

The upper uses the same charging handle, forward assist and spring loaded ejection port cover like on my .223 upper. The CMMG upper fit right on my Bushmaster lower. The upper is an M4 style, no front or rear sights. I put a VORTEX SPARC red dot on it and a VLTOR adjustable stock, did I mention FUN.

http://www.cmmginc.com/category_s/1553.htm



Fun, handy little gun, got a lynx earlier this week with it. Now my wife wants one.

Last edited by moose fat; September 23, 2012 at 02:21 AM.
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Old September 24, 2012, 04:29 AM   #4
Justice06RR
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If you can afford the complete 22 upper, I suggest that route. it will be more accurate and reliable. but if you are on a tight budget, the 22 conversion kit should be fine. just know that your accuracy will suffer a little, along with reliability.
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Old September 25, 2012, 05:51 PM   #5
jaymce
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I agree with Moose Fat.

CMMG dedicated upper. Great fun. Can not say enough good about the folks at CMMG, bent over backwards to make for a great transaction.
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Old September 25, 2012, 11:11 PM   #6
Eghad
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I purchased the same CMMG dedicated .22LR Upper as Moose Fat did. Put a separate CMMG Lower on it that I traded for. I wouldn't use a conversion kit after shooting it.
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Old September 26, 2012, 08:58 AM   #7
Destructo6
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I have 3 of the complete .22lr CMMGs. Twist rate is 1 in 14 or so.

Garbage all.

Accuracy is, typically, about 12" at 50 yards. Failure rate is about 1 in 20. Magazines are difficult to load past 15 rounds, even with the loading tool.
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Old September 26, 2012, 09:16 AM   #8
Kimio
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This was something I was considering too. I was looking at the conversion kit for my M16 stlye AR.

It has a 1/9 twist and a 20" barrel, is the accuracy really going to be that poor if I were to use the drop in kit?
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Old September 26, 2012, 11:39 AM   #9
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I haven't tried it myself, but I've heard that you can clog up your gas tube using a .22 conversion kit in an AR. Because of the coatings on most .22 ammo and the fact that it usually burns dirtier than 5.56 ammo, lead and carbon fouling will end up in your gas tube. Supposedly if you fire a few 5.56 rounds after every hundred or so .22 rounds it will blow out the gas tube, but even if that works the lead and carbon fouling is still going to dirty up the rest of your gun faster than with 5.56 ammo.

Lead and carbon fouling aside, the rifling twist is going to hurt the accuracy of the smaller .22 rounds, and you're going to have to re-adjust your sights every time you switch back and forth. Many people save themselves all the trouble and just get a dedicated .22 upper.
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Old September 26, 2012, 12:33 PM   #10
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Thanks for the information, I may just go that route in the end then.
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Old September 26, 2012, 01:20 PM   #11
K1500
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The Ciener (sp?) kit I had worked poorly in 2 AR's and not at all in a third. All were different brands and the kit was tried with many different brands of ammo. Maybe I just got a bad one.
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Old September 26, 2012, 03:51 PM   #12
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Quote:
I have 3 of the complete .22lr CMMGs. Twist rate is 1 in 14 or so.

Garbage all.

Accuracy is, typically, about 12" at 50 yards. Failure rate is about 1 in 20. Magazines are difficult to load past 15 rounds, even with the loading tool.
Yikes, that was harsh. Was the first one bad, the second worse and the third trash?
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Old September 26, 2012, 04:40 PM   #13
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"I have 3 of the complete .22lr CMMGs. Twist rate is 1 in 14 or so.
Garbage all. Accuracy is, typically, about 12" at 50 yards. Failure rate is about 1 in 20. Magazines are difficult to load past 15 rounds, even with the loading tool. "

If the first was so bad why buy the second, and if both the first and second were so bad why buy the third?
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Old September 26, 2012, 04:43 PM   #14
Marquezj16
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I went the other route and bought a dedicated 22 lr rifle.

Mine is the M&P 15-22. One of my favorite to take to the range.
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Old September 26, 2012, 05:47 PM   #15
Fishbed77
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Just get a CMMG dedicated .22LR upper. Well worth the extra $200 or so over the conversion kit. Here's a link to my experience with mine:

http://www.thehighroad.org/showthread.php?t=668410
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Old September 26, 2012, 09:18 PM   #16
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I had a s&w mp 15-22, I couldn't get rid of it fast enough. I don't rec one of those to anybody
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Old September 27, 2012, 12:08 AM   #17
OcelotZ3
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Interesting.

I have two conversion units, one is an old military one and the other is an Atchisson from the early 70's. Both work great for plinking. I need to check it out sometime for accuracy at 50 yards.
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Old September 27, 2012, 07:25 AM   #18
Kimio
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Does anyone own both the dedicated upper and a conversion kit? I'd like to see an accuracy compairison if possible.
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Old September 27, 2012, 08:48 AM   #19
Marquezj16
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Quote:
I had a s&w mp 15-22, I couldn't get rid of it fast enough. I don't rec one of those to anybody
What was wrong with the one you had?
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Old September 27, 2012, 06:08 PM   #20
1911steelplate
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I found out the hard way that if the bolt doesn't close all the way the hammer still falls and strikes the firing pin. I had this happen and blow the side of the bolt apart. I sent it back and they were good about repairing the problem, said they had updated the recoil spring with a new one that fixes the problem. But the problem wasn't fixed, if it feeds a round and the bolt stays open a little the firing pin still strikes the back of the round. My new Sig 522 doesn't do that, just sayn. I haven't tryed the h&k or colt ar platforms.
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Old September 27, 2012, 06:16 PM   #21
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Thanks for the info. I'll keep a lookout for that. Hope it never happens though.
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Old September 28, 2012, 09:32 PM   #22
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I have talked to several people that shoot steel plate with me that love thiers. Without any issues at all, and far more rounds ran through thiers.
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Old September 29, 2012, 01:07 AM   #23
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My CMMG .dedicated 22LR feeds reliably on Federal 36 grain copper coated .22LR and with a red dot shoots within 1 to 1.5 inches at 50 yards. Put a couple of hundred rounds through it at one sitting no problems.
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Old September 29, 2012, 09:12 AM   #24
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I know of three different owners of the CMMG S/S bolt kits that love them. No function problems in a Colt,two different Bushmasters and one Stag. Slight variations in accuracy with different brands of ammo. Best results in all guns using the mfg's. suggested round (Federal 550 bulk pack). Easy clean up and as stated above run a few rds of .223 thru it and the gas tube is purged. YMMV. tom.
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Old September 29, 2012, 12:23 PM   #25
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The CMMG dedicated upper (I bet most dedicated uppers) use a straight blow back system so the gas tube is not needed.

I get great accuracy with mine but agree anything over 15-20 rounds in a mag become dificult.

I have not tried them in the CMMG upper but if the S&W 15-22 mags fit and worked then that might be the trick as they have a thumb slider to help take the pressure off the spring when loading.

I like the 15-22 I shot but it did not have the same feel as my AR, for the same $ like being able to have about the same combo in .22 and 5.56/.223 while retaining the use of the lower for both uppers.
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