"rifle length" ar 15 .22 upper

[jeffreyliu838]

Looking for a .22 upper with a 18-20 inch barrel. Anyone have a cmmg one?

http://www.midwayusa.com/product/615478/cmmg-ar-15-a3-flat-top-upper-assembly-22-long-rifle-1-in-16-twist-20-barrel-wasp-melonite-finished-chrome-moly-matte-with-a2-front-sight-flash-hider

Anyone know if that's the live round extraction model? Thinking about backordering it if it is, but I can't tell... Maybe I'll wait for the day they get it in stock and order it with a coupon code.

http://www.midwayusa.com/product/866746/cmmg-bolt-hold-open-actuator-for-22-long-rifle-conversions-ar-15-polymer

Anyone know if any non cmmg evo mag will still work with that?

[sholling]

There may be something available but just as an FYI a 22LR has pretty much reached maximum velocity in 16". Some 22s have longer barrels but primarily for a longer sight radius or added mass or just looks.

[jeffreyliu838]

Even with faster loads? Partly I want a 20 inch so I can own a m16 style gun and also add a .22 to my collection, but it's not worth it to me if that extra 4 inches is just worthless.

[shadow65]

You might gain a little velocity with high velocity ammo but in general, .22 has already reached it's peak at 16"-17".
The 20" .22 from CMMG is actually 18.5". 1.5" is inside the receiver.
I know at least the stainless bolt models all have live round extraction.

The 20" I tested shot under 1" at 50 yards consistantly.
Dave n

[jeffreyliu838]

Woops screwed up those links.

Wow, that sells me on the 20". That's tighter than I was expecting. Does anyone know anything about mag compatibility with the bolt hold open actuator? The upper doesn't come with mags.

[fmunk]

Woops screwed up those links.

Wow, that sells me on the 20". That's tighter than I was expecting. Does anyone know anything about mag compatibility with the bolt hold open actuator? The upper doesn't come with mags.

My guess... Black Dog Machine mags.

[tanakasan]

^^BDM...but there are 2 types be sure to get the correct one! You need the one with the tall "tower" feed lips.

Robert

[shadow65]

The only mags that will operate the BHOA automatically is the CMMG Evo mags.
Standard mags can be used with the BHOA locking the bolt back manually.

In all fairness, every CMMG .22 upper I have tested shot 1" or less at 50 yards with Wolf MT and a scope.
Dave N

[jeffreyliu838]

Dang. I don't think I'm going to be able to find the evo mags for a while...

[zio]

If you're terribly impatient like I am, looks like CMMG has this 16" complete .22 upper in stock, from their Revolution line - http://www.cmmginc.com/product_p/22b7cd7.htm. It's the only complete .22 upper I could find in stock anywhere, besides the ATI/Chiappa.

Price was $449.95 on the 31st when I pulled the trigger, vs approx $399 for their "standard" models, but we have a lefty shooter in the family so the ambidextrous feature is worth the extra $50 to me. But now they're $529.95, which is in the $500+ territory of the other dedicated uppers from DPMS, Tactical Solutions, Nordic.

[2nab]

Please look also at Nordic components nc-22 uppers. Multiple barrel lengths 16", 18", 20", and multiple configurations available. Currently out of sock like everything else but worth the wait.

[louis headsmasher]

i own a CMMG upper and my bolt hold open has never worked. my brother owns same make/model and his works fine. could be the lower i guess. i have adjusted it many times to try and get it to work but to no avail. mine is mounted on a frontier arms poly lower and before i got that, it was mounted on a noveske. never worked on either. prolly operator error. will contact cmmg to see if i can get to work but at this point, total waste of 20 bucks. oh, forgot to mention, using cmmg's revolution line of mags. and for what its worth, it's freak'n awsome to shoot with no regrets on the price 525.00

[shadow65]

The biggest issue with the BHOA is the bolt catch spring pressure. It varies from one lower to another and if too stiff, the mag spring cannot overcome it.
I have trimmed a couple coils off the BC spring with success.
You can also put an o-ring around the bolt catch paddle to releive some pressure and to see if that is the problem.
CMMG now includes reduce power BC springs with the BHOA.
Dave N

[louis headsmasher]

thanks for the insight shadow65. i will look into that. would love for the BHOA to work, then it will be perfect.