Does anyone here know, or have had experience with, the CMMG Bravo .22 LR Conversion Kit? Seems like that may be an alternative to the availability issues of the 5.56 ammo. .22LR is still available at around 10 cents per round for the copper coated RN and HP.
I have had a couple of those kits over the years.
If you have a lightly used (read not abused and shot out) in-spec AR barrel the accuracy is pretty decent to about 75 yards (index card hits, if you know your holdovers).
Barrel twist doesn't seem to matter much, except that short barrels need a tighter twist (1:7).
I've used them on quite a few squirrel hunts, with great results.
For what they are, a training tool, they do the job well.
If you are an avid AR-runner, then the cost isn't bad considering that you get to use the same trigger and setup from your go-to gun.
I have heard the horror stories, but I've had more trouble from 10-22s and GSGs than I've ever had from the .22lr kits.
I like them so much so that I built an AR a couple years ago (Trump-slump cheap) to home the .22lr kits exclusively and sold the others (but I keep the extra full size BCG just in case).
Now the problem is I don't want to shoot up all my ammo, since resupply is.....questionable (I only shoot Aguila 40gr SCHV).