Originally Posted By: Falken
Ok, I'll have to take what Pablo said into consideration and seeing people offering Thompson Center suggestions, I'll revise my choice to:
Colt AR or Bushmaster with .22LR kit.
Never used a .22LR kit and only shot an AR once in Calgary on Blackfoot trail at an indoor range with .223 ammo.
Anyone have any comments on .22LR conversion kits for AR-15's?
Who makes the best AR? Bushmaster, Colt?
People will say different, and say things like "_______ is just as good as..." but I like Colt. I think it's the standard for comparison. I tell this a lot, but one more can't hurt:
Full-time instructors see ever make if every gun out there, they know what works ubder hard use and what doesn't, and every one of them I know owns Colt.
Regarding conversion kits: I only have experience with the CMMG. Places like CDNN have it on sale fairly often for around $150. It took a few magazines of shooting to break in, but after that it has generally worked fine until it gets dirty and nasty.
I have a spare upper that I leave it in, because it does get dirty, especially in and around the all-important chamber area. I wouldn't switch back to 5.56 without giving at least that area a good cleaning, and by using the spare upper I don't have to.
The point if impact was so different with most barrels that it was either adjust the sight a lot (and risk forgetting) or hold off, neither of which is optimal.
Before I dedicated that old upper to it, I found that some barrels shot .22 OK and some didn't. Even when the barrels were otherwise identical- same make, twist, material, one would do fine and the other would scatter shots. It's a blind draw whether your gun will like .22s or not.
With the barrels that do best with .22, accuracy is OK to good, but not great. For why I need it to do, it only needs to stay on an IPSC/IDPA size silhouette at 50 yards, which it does easily. I have .22 rifles that shoot well, so will use those if an when I need better. I just need cheap practice with an AR.
My biggest complaint is that it doesn't operate the regular bolt stop, which screws up reloading practice some.
So yes, there are negatives. But I happened to have an upper that handled .22s fine, so it works for me.