Posted: 7/18/2011 9:00:59 AM EDT
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I'm wondering how many buy a dedicated .22 upper/AR vs. the Conversion Kit. I have a CMMG Conversion and its dirty and wondering if i'm ruining my bbl running .22 through it.
thoughts? |
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You won't ruin a thing as long as you clean it.
And if you're cleaning it frequently enough to keep it reliable, then that's often enough. The barrel was made to handle jacketed .224 dia. projectiles up to 80 grains of weight and velocities above 3000 FPS. .22LR is undersized, softer, slower, lighter, and MUCH lower pressure than the ammunition the gun was made for. It can't hurt a thing. Pull a boresnake every few mags and call it good. |
| I have both. Got the Ceiner .22 kit about 11 years ago. In my Bushmaster 20" A2 upper with 1/9 barrel it shoots about 2" at 50 yards. In my Colt 6920 with 1/7 barrel it's about a 4" group at 50 yards. Fine in either upper for "minute of beer can" but not real good for any serious target shooting. If you fire a few 5.56 rounds when you are done with the .22 kit you will help keep your gas tube from fouling. The biggest problem if you shoot tons of rimfire is leading in the chamber and barrel. I switched over to a dedicated upper since I was teaching my kids how to shoot and it's kind of hard if the rounds are all over the place. I have CMMG dedicated upper and it is awesome. I ran over 600 rounds suppressed yesterday with mine with ZERO malfunctions. My 10/22's would never come close to that kind of reliability in a million years. |
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I have old M261 kits. 22lr works great in 1/14 and ok in 1/12 barrels. A 1/7-1/9 is a waste. So if you have the subcal kits run them in a fast twist barrel. Otherwise your groups look like a shotgun blast. M261 are half the price of a upper. Thats why I run them. I can drop them in any 5.56/.223 rifle (AR) for a little fun.
This is ARFCOM so get both 
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I've also got a M261. I've never had a problem with 1:9 twist barrels at 25 yards; 1" groups and pretty much the same point of impact as my 5.56 zero. I start seeing alot of drop (and group size increase) at 50y and 100y. I've haven't yet tried it at 50y with my 1:12 barrel, I expect it will be a bit better.
If you're looking for training and/or firearms education of the young-uns the conversion kits are hard to beat for cost/benefit. If you want the best in accuracy for plinking beyond 25y or small critter hunting then go with the dedicated upper. |
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I have a Ciener conversion that I have had for about 15 years. With my 20 inch bushy upper, from the bench, I can shoot 1.5 inch groups at 50yds. My 16 inch M4 gives me the same grouping. Both of these are with Winchester Xpert ammo from Wally world. If I buy Fed Classic ammo, the groups open by 1/2 an inch.
This is fine accuracy for practicing position shooting or just for trigger time for proficiency. I don't know off anyone who shoots an AR dedicated upper in .22 matches as a 10/22 walks all over it with a minimum of aftermarket work. Save the extra money a dedicated upper will cost and buy more ammo for your CMMG conversion. It will pay better dividends. |