Posted: 7/6/2010 6:13:38 AM EDT
| I want one to practice with. How bad will this lead up my gas port? I'm thinking of getting a cheap ass upper and using it as a dedicated upper. |
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It's basically a myth.
Sure, some small amount of lead might be "shaved" up & into the gas tube by the gas port hole. But I guarantee you that the first round of full-powered .223/5.56 ammo will blast it right the heck outta there, and back into the action. I would be more worried about it clogging up the BC insides, which is also not really an issue. |
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Simple decision...
Cost of CMMG 22 kit Stainless with two mags from CDNN $190? Can use it in ANY of my ARs sticking with the same configurations Dedicated 22 Guns... 450-800 one configuration, the lower cost ones are plastic and you can't change the configuration... No brainer for me... Conversion kits RAWK... I have 3 different ones CMMG standard and Stainless and a Military M261 kit. |
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I have a conversion I use in my .556 AR's sometimes.
Pros: -You can take it out and put it in any upper that is .556/ .223 -Cheaper than a dedicated .22 upper -They are great for getting your .556 close when sighting in, and the POI isn't far off at 25'ish yards Cons: -Accuracy will not be great. Anything over 25 yards is pretty scattered, as in 6-12 inches @ 50 yards -I've had minimal problems with it getting dirty and not running right -No last round bolt hold open I also have a S&W 15-22 as well as a CMMG dedicated 1/16 upper . The CMMG feels "heavier" and more "real" , for lack of a better term, but the S&W is by far the more accurate and fun gun out of all the above choices I personally have. I love the Smith. 
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One other down side is that your iron sights, or optics won't be zero'd for both. Thats why I think I'm going to get rid of mine. They will be pretty damned close within reasonable range. I have tested mine at 100 yards with 1:7 and 1:9 and 1:12 from 14.5, 16 and 20" barrels and the zero shift was minor, the group SIZE on the other hand was a bit startling, double the norm. Now it could not hold a candle to my Stevens US Property 22 bolt gun... That thing is a TACK Driver! |
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shooting .22 thru your AR is just flat out fun........as to what you're going to get, theres a couple ways to look at it
-accuracy??? Dont waste much time with a conversion -reliabilty??? You may want to consider the S&W if you dont intend to "tune" a conversion or dedicated upper and stick with that ammo...this is even more true if you have FA or a silencer -luxury??? .... .22 conversion........you can shoot .22 in your rifle, may require some tuning, wont be the most accurate, gun will always feel the exact same as when shooting 5.56 .... S&W.........you have a second rifle (always nice), it costs a little more, weight is WAY off from your 5.56 AR, accuracy seems good from what I've seen, you're stuck with S&W's magazines as BDM/CMMG mags will not work......all this goes for the Colt/Umarex version as well. .... Spikes dedicated upper/rifle.........depending on barrel accuracy can be outstanding for .22lr, if just an upper you can swap to any lower and build the upper as a clone for a very similar feel, if a dedicated rifle you can build as a clone or something completely different if you like, your upper/rifle may require some tuning or be ammo sensitive, no potential (yet unlikely) issues with lead fouling, having a separate rifle is an AWESOME luxury that is compatible with a RR/DIAS, tuneable for a silencer, and quick to grab and shoot. I went with a dedicated rifle built with a Spikes .22 upper and lothar walther barrel.......this thing is uber accurate, and now that properly tuned has become more and more reliable. I usually keep it unloaded with loaded mags and my silencer near it, when a coon or something ventures into the yard I can immediately snag it and be able to take him out instead of breaking open uppers to put in a conversion and then hoping the accuracy is good enough for a humane kill. The S&W was not an option for me as they didnt have threaded barrels on the ones I looked at, and the later ones had an odd thread pattern (?), they felt like plastic, and didnt use widely available BDM or CMMG mags. |
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One other down side is that your iron sights, or optics won't be zero'd for both. Thats why I think I'm going to get rid of mine. They will be pretty damned close within reasonable range. ! This. At 25 yards my 16" Was the same with both boolits. |
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I love my dedicated. I only have it for training and fun though, as my 10/22 is still king of the roost.
It's one of the first gen CMMG rifles. It will only shoot high velocity 36 gr and under rounds reliably. I haven't messed with the feed ramps or chamber yet. With a BDM full of Stingers it wouldn't be a pretty day for a home intruder though.... 
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My zero at 25 yards was almost a foot low to the right. And it doesn't function all that well in my SBR. What kind do you have? I have run my 261 in SBRs no problems, same with both CMMG kits... no problems and the Zero shift has been nowhere NEAR a foot off. |
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-No last round bolt hold open
CMMG is working on a BHO adapter. :) I have a love/hate relationship with my Spike's kit. It isn't very reliable for me. But, I have a total of 6 mags between CMMG and BDM. Fortunately, it is very accurate in my main 24" 1-9 upper. My 16" 1-9 upper hated it for accuracy. Were I to do it over, I'd probably just get a dedicated 22 upper, or a S&W MP15-22. (without trying to get the thread locked or anything like that, I would be interested in selling my Spike's kit and mags....) |
| I have the CMMG stainless and love it. Mine is pretty close to dead on, with no sight adjustments between 5.56 and ,22 at 25 yards, Mine likes the Federal 40 grain the best. After shooting a bunch of .22, I fire a few rounds of 5.56 to blow out any junk left in the gas port/tube. |
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Not all dedicated .22 rifles are plastic. This might be a good option for you. http://www.ar15.com/forums/topic.html?b=3&f=124&t=499383 starting at less than $500.  |
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I've got a Tac-Sol dedicated upper. It shoots very accurate and is reliable. Yes it did take some shooting to break it in and get reliable, but all .22lr kits or uppers seem to need to be broken in.
The CMMG .22lr rifles look very interesting, especially at the prices. If I didn't have an upper already that's what I would get. |