Mine like Aguila SV. My M4 profile might like the high velocity even better, but I've not had to the hundred yet.

I see your flash hider. I picked up a pack of 10 3/8 interior diameter O-rings from Lowes for $2 and use that in place of a crush washer on the 22lr. I think the three benefits are 1) it puts very little pressure on the threads, 2/ the rubber may dampen vibration from any muzzle device that may be at a different frequency, and 3) I can switch devices at the range.

I've found that different devices influence groups differently, but it took bringing a bag of all my muzzle device junk to the range to find out. I'm somewhat partial to thread protectors just because they let keep the crown clean, but they don't always give the best groups.

Please forgive my curiosity on a couple of points. Does the Pressure Plug improve function? Does your rifle run without the buffer or buffer spring present? Does your bolt catch ever fail to keep the bolt back on the last round? If so, does this happen with particularly hot ammunition?

Does CMP require a service rifle configuration, or would you be allowed to enter with a free floated barrel and plain vanilla tube for a handguard?

 

So many questions lol



The flash hider came on the upper from CMMG, I've never touched it nor do I see a reason to at this time. I've honestly never thought about barrel harmonics, et al; I see no reason to delve into the minutia when I'm still on a macro quest, like best ammo for this beast lol but I appreciate your efforts and am interested in any results you find signficant enough to post

The pressure plug extends beyond the buffer retainer and imparts positive forward pressure on the BCG. My rifle has yet to have an issue with the BCG retreating "out of battery" but it seemed a good preventative measure. It also quieted the spring rattle, yes I kept the stock carbine buffer and buffer spring in the tube.

So far with the BMA, no failures of the bolt catch retaining the bolt. I'm also using brand new 15/22 mags, I wonder how performance will change when the mag springs wear. So far I've only show 1230 fps HV type ammo in this rifle, with good results, function-wise.

The CMP question is a good one, and for the most part they generally follow the highpower squadding and scoring rules but have obviously made many concessions for small bore/rimfire. The AR is somewhat a new contender in the small bore arena and depending on who is running the match I've seen bolt actions compete next to semi-autos, so I think there is a wide swath of what's acceptable. In reality, we welcome any and all would be competitors to the sport at the entry level, so there is a lot of leniency. That being said, at the national/NRA-sanctioned level, the matches with be stringently defined and classes enforced. I'm not sure there is a small bore service rifle clone class, but if there were, your free-floated rifle would fall into the match class and you'd compete against space guns and anchultz-type rifles with fancy sights and exotic, well-developed handloaded calibers - we would probably not stand a chance lol

 

Nice build, these .22 rimfires are sure addicting!

 

You're telling me, brother [emoji6]

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