Mid length or CAR 9mm?

**C4IGrant** · 01-21-07, 13:04

Originally Posted by M4arc

What about RRA 9mm lowers?

Can order you one of those if you like.

C4

**Nathan_Bell** · 01-21-07, 17:33

Originally Posted by 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

How does the RRA mag well adaptor attach to the lower? I have been thinking about your suggestion on feeding the beast and 9MM might be in the future, but I do NOT want to take a chance on damaging my lower.

**SuicideHz** · 01-21-07, 18:51

what's a "gasblock half moon thing?"

**Dport** · 01-21-07, 19:37

Originally Posted by SuicideHz

what's a "gasblock half moon thing?"

I'm guessing the brass deflector, which for the 9mm is also supposed to deflect gases.

**C4IGrant** · 01-21-07, 19:42

Originally Posted by Nathan_Bell

How does the RRA mag well adaptor attach to the lower? I have been thinking about your suggestion on feeding the beast and 9MM might be in the future, but I do NOT want to take a chance on damaging my lower.

You tighten a screw at the bottom that locks it into place.

C4

**M4arc** · 01-21-07, 19:42

Originally Posted by Nathan_Bell

How does the RRA mag well adaptor attach to the lower? I have been thinking about your suggestion on feeding the beast and 9MM might be in the future, but I do NOT want to take a chance on damaging my lower.

Yeah, does the RRA 9mm lowers use an adapter? Is it forged that way or is there some sort of permanent adapter?

**Nathan_Bell** · 01-21-07, 20:22

Originally Posted by C4IGrant

You tighten a screw at the bottom that locks it into place.

C4

Two questions on that. Is it possible to over tighten and break stuff? Do you still use standard mag release lever?

**Resq47** · 01-21-07, 22:25

Originally Posted by M4arc

Yeah, does the RRA 9mm lowers use an adapter? Is it forged that way or is there some sort of permanent adapter?

Hope so, my spare 5.56 lower is a 9mm marked RRA.

IOW - They're the same as 5.56 other than the marking.

**mark5pt56** · 01-22-07, 06:27

I suggest the top loading block. "drops in" from the top, mine was really tight, they are pricey for the good ones.

I strongly suggest having the bolt ramped by Lee Minor and you need the 9mm hammer. If you don't ramp the bolt, the hammer/trigger pins take a beating and are subject to breaking, hence the suggested ss pins. The hammer "hook" will also beat the piss out the disconnector. Cure for that-ramp the bolt and grind it(hammer) down some. If I remember correctly, once the bolt is ramped, you can keep the regular hammer.

M4arc, For info, Bob Yurina did all of my work, modified th emags, cut the barrel, installed the tros 3 lug, etc.
Simply Dynamic has the upper now and is on one of his pic threads.

My true suggestion-save the money and don't do any of it. Unless you need a secret squirrel suppressed limited range sniper stick.

oh yeah--the set screw block is a piece of crap, doesn't stay, will mark the lower up. I've seen peopl edo permanent mods to the lower to keep it locked in.