If anyone cares: I just picked up a CMMG .22 conversion bolt and some BDM magazines (the full-profile ones) in the hopes of getting some less expensive M4 training time. I know it isn't the SAME as shooting full 5.56, but for running drills at under 100, I have high hopes for it.
Good news: The kit ran like a sewing machine in my Mk18/10.3 using CCI Mini-Mags. 400 rounds downrange with no malfunctions of any kind and 'respectable' accuracy (I can make 25 yd headshots with it no problem, on the walk). I didn't bench it, because I didn't buy it for that.
I lubed it generously with CLP before firing the first shot, and I plan on treating it like my 5.56s: WET.
So far, so good. I'll check back in when I've had more time to wring it out.


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