Re: AR-15 .22LR Conversion, thoughts?
My brother gave me that exact bolt conversion (CMMG bolt) for my birthday with one of the mags listed. I've only had a chance to take it to the range once, but it was a ton of fun. I was able to sight in a replacement Trijicon Tripower scope that had just been returned to me from the manufacturer's RMA department.
The design is ingenious...the entire recoil mechanism is built right into the bolt. I was able to sight in my gun without spending $$$ on .223. I went through 4 mags worth of ammo. The only issues I had were on the last mag. I had a couple times where more than one bullet was fired. I don't know if it had something to do with the dirt buildup from .22lr rounds or what. At the end of that 4th mag, I had about 4 rounds come out with one bullet squeeze and I decided to stop until I had time to check it out. I haven't had time to dig into further...when I got home I cleaned it thoroughly and didn't notice anything odd. I assume it was slam firing. I haven't looked at it enough to say whether or not the problem was something unique to my setup. I'll probably take it up to my local gunsmith and have him take a look at it before firing again.
The one thing I do worry about is buildup in the gas system from the dirtier .22lr round. I always shoot some .223 afterwords to try and blow out any buildup. Dunno if it really does anything or not.
All in all, if I can get the firing issue worked out I think it's awesome product.