Mid length or CAR 9mm?

[M4arc]

Does the mid length gas system make much of a difference in the 9mm carbines?

I see that ADCO mostly carries the mid length barrels. Now I love mid lengths and I'm interested in building up (or buying) a RRA 9mm but I'm not sure if I want a middy or a CAR length gas system.

[LOKNLOD]

Do 9mm ARs use the gas system? I thought it was blowback operated?

[M4arc]

Do 9mm ARs use the gas system? I thought it was blowback operated?

I have no idea, I just see Mid-Length and CAR systems offered.

[LOKNLOD]

I have no idea, I just see Mid-Length and CAR systems offered.

I think the CAR vs. Mid is only a matter of which handguard length you prefer in 9mm ARs. Unfortunately this is like the blind leading the blind so I should probably shut up until we find a definitive answer on this

Check out the 9mm bolt/carrier at ADCO (upper parts page). No gas key.

[M4arc]

I think the CAR vs. Mid is only a matter of which handguard length you prefer in 9mm ARs. Unfortunately this is like the blind leading the blind so I should probably shut up until we find a definitive answer on this

Check out the 9mm bolt/carrier at ADCO (upper parts page). No gas key.

Yep, I just saw that!

You're right, it looks like it boils down to rail space. However, I also saw the RRA 10.5" upper

Maybe I'll go ahead and get the lower receiver and send off the SBR paperwork

[chrismartin]

I'm building up a 9mm as we speak.

The 9mm is blowback, not gas operated. I went with a 5.5" TROS 3 lug barrel.
I plan to put carbine length hand-guards for use with my suppressor.
I figure, if I'm going to SBR, I might as well go short
The best prices I've found for a lot of the 9mm stuff is ADCO and Rainier.
Also, if you are building your upper, you don't _need_ a 9mm upper, but it will help with the gas blow back, especially if you are a left handed shooter. The 9mm upper has the gas block half-moon thing on it.

My build will be:

LAR Giz lower (SBR'ed lower)
RRA upper
TROS 5.5" bbl
Magpul CRT stock
probably YHM hand-guards, but I haven't decided yet.

Chris

[Dport]

My Colt 9mm is blowback operated. I don't think I've seen a pistol caliber AR that uses anything but blowback.

Although, I'm willing to admit there is way more stuff out there than I've seen, so I could be wrong. In this case, I'd say my confidence is high.

[C4IGrant]

9mm is 100% blow back (no gas system). I personally like the middy"look", but it is really just personal preference.

Marc, I have the RRA middy 9mm uppers in as well.



C4

[AR-15A3]

I built my RRA A4 16" with CAR handguards last April and later on when I SBR it, shorten it to 10.5".

Someone also told me that there was another way, get the middy with the gas block model, change the handguards to a middy FF rails (or longer), when converting to a SBR just remove the gas block (it won't have any holes under the barrel like a standard FSB), shorten the barrel and use a can as an option.

If you're going to use a can, make sure the can is compatible with the FF rails you're going to use.

My 9mm carbine have all RRA components except the Hahn top load mag block, Colt mag, duckbill grip and an aftermarket buttstock.

C Products will be releasing their Colt clone 32 rounds mags by the end of this month, their version is a stainless steel with black teflon finish and same as Colt's bolt hold open followers for around $30 each.

[M4arc]

9mm is 100% blow back (no gas system). I personally like the middy"look", but it is really just personal preference.

Marc, I have the RRA middy 9mm uppers in as well.



C4

What about RRA 9mm lowers?