9mm AR

dctag · #1 06-07-06, 10:07

Hello,

What have been peoples experiences with the different 9mm AR's? I have been looking at buying a RRA upper but I thought I would ask what else people have had success with and what you have found to be unreliable.

Thanks,
David

Master Blaster · #2 06-07-06, 18:24

You won't go wrong with a Rockriver 9mm upper.
what lower are you going to use ?(you need a round face hammer for it to work with 9mm.)

Brian

GI_Brat · #3 06-07-06, 19:58

I have a Bushmaster and have been very pleased with it.

BravoCompanyUSA · #4 06-07-06, 19:59

I don't have a lot of 9mm AR experience, but generally speaking I would recomend going with a 9mm system that has a interchangable mag system with Colt. It is my understanding that there are a small variety of mags, mag well blocks, etc for the 9mm platform. Going with the Colt type system should give you the largest choice when it comes to aftermarket parts or accessories that are offered now or might be offered in the future.
I think the RRA uses the same Colt mag system.

Mooneys · #5 06-07-06, 21:47

My RRA 9MM SBR has been flawless for me. I had the bolt shaved and am using an M16 hammer instead of the standard 9MM hammer.

Oh Yea...and lots of eye candy

C4IGrant · #6 06-07-06, 22:00

I have one of the first RRA 9mm's made. It has run perfectly and I love to shoot it. I would recommend going with a Colt based mag system as you can use the 9mm Beta's!

C4

www.GRTactical.com

JTAC_Supply · #7 06-08-06, 09:27

My 9mm RRA has also run like a top. Right now I'm using the VM-Hytech mag block and un modified UZI magazines, and have had nothing but reliable feeding and fun

The Colt style mag system is a good idea if you want to run beta mags as above. Right now I don't have an M16 so the VM system seemed a better idea for me personally.

OH, and I have midlength RRA uppers in stock now

Jason

watersniper · #8 06-13-06, 13:49

I am running a 7" cut down RRA 9mm barrel from ADCO. I then added a Gemtech Trinity. Mag block is RRA, it works well. Magazines are modified UZI and Pro Mags. The Pro Mags so far have all held the bolt back after the last shot, but they don't drop free. The handguard is a DD 7.0, with a PRI front flip up and a YHM flip up rear. It's all topped off with an EOTech 512. Oh yea I'm running a Geissele match trigger, it works unmodified with this 9mm setup! No bolt ramping needed.

Once upon a time I had an Oly system 9mm. It worked, but I didn't like the magazines with the attached mag block as much as the Colt/RRA system.

MajHavoc · #9 06-15-06, 14:23

I just finished my 9mmAR build using RRA upper and lower, 5" TROS 3-lug barrel, and VM-Hytech mag block w/ un modified UZI magazines. First time out it ran like a champ. The only problem I experienced was with a damaged mag that wouldn't feed properly. My Trident 9 is inbound and will finish off my project.

**M4arc** · #10 07-23-06, 22:53

Can someone take a picture or two of this mag block and explain to me the difference between running modified vs unmodified Uzi mags?

With the price of 5.56 going through the roof the sound of a 9mm AR is sounding better and better.

#11 07-24-06, 00:35

I personally love the 9mm AR platform. It's probably that fastest (mag changes) SMG ever made. The only way it could be made better is if it had a locking breech design. Without it locking feature, suppressing sound is hard to do when gases escape through the ejection port.

Even thought the UZI magazine conversions are nice, I have never got use to it. Every time I change the magazines, I accidentally keep hitting the original release, ejecting the Uzi magwell adapter.

Eric

VM HY-TECH Uzi Mag Adapter

Hahn Precision, sleeve adapter

ArchAngel · #12 07-24-06, 03:32

I have probably the most simple set up:

Bushmaster Carbon 9mm with EOTech 512. It runs the polymer mags and Colt mags.

No problems whatsoever and the abiltiy to use Colt mags is a plus.

I've shot over 1000 rounds out of it so far and it runs great.

The light weight of the carbon fiber is nice and have seen no problems with durability.

CapnCrunch · #13 07-24-06, 06:16

Quote:

Originally Posted by VLTOR

I personally love the 9mm AR platform. It's probably that fastest (mag changes) SMG ever made. The only way it could be made better is if it had a locking breech design. Without it locking feature, suppressing sound is hard to do when gases escape through the ejection port.

Even thought the UZI magazine conversions are nice, I have never got use to it. Every time I change the magazines, I accidentally keep hitting the original release, ejecting the Uzi magwell adapter.

Eric

Breech blast when running suppressed is the only thing that holds it back. It's not as noticable with really short barrels, but I'd still prefer a locking breech. It'd be nice when used in conjunction with CQBR length barrels, as opposed to the Glock 34 length ones that you need to get it pretty damn quiet.

**KevinB** · #14 07-24-06, 06:54

I had good luck with a Colt RO934 SMG -- I like the fact that unlike the MP-5 the drills where (more or less) the same as my carbine.

Cold · #15 07-25-06, 00:50

Question: Has anyone tried or does anyone currently make a mag block or conversion for taking the 33 rnd Glock Hi caps?

CQB · #16 07-28-06, 00:23

Quote:

Originally Posted by VLTOR

I personally love the 9mm AR platform. It's probably that fastest (mag changes) SMG ever made. The only way it could be made better is if it had a locking breech design. Without it locking feature, suppressing sound is hard to do when gases escape through the ejection port.

Even thought the UZI magazine conversions are nice, I have never got use to it. Every time I change the magazines, I accidentally keep hitting the original release, ejecting the Uzi magwell adapter.

Eric

VM HY-TECH Uzi Mag Adapter

Hahn Precision, sleeve adapter

Eric,
I have the same uzi mag block. I just got it and installed it in a PWA lower where it fit fine. But when I mate it to a RRA 9mm upper something in the block doesn't allow a flush fit. Do these blocks require minor smithing?

eklikewhoa · #17 08-10-06, 08:55

Quote:

Originally Posted by Cold

Question: Has anyone tried or does anyone currently make a mag block or conversion for taking the 33 rnd Glock Hi caps?

olympic offers rifles that accept glock mags in either 40 or 9mm

Longboat · #18 08-11-06, 13:12

I've built a couple of 9s. I actually prefer the colt 2 piece block to my top load single piece. I was told when I bought it.. that it was a RRA block, but I think it is an ASA... I had to do a lot of work to the feedramp to get it to feed hollow points. The colt was a simple trial and error phase, got the spot.. drill and pin.

I too have found the ProMag waffle mags to be extremely reliable with no hiccups or feeding issues. At $12 from Natchez, they are a smoking deal. I have had no issue with Colt mags either, but I only have the plastic follower type. Both have always activated the BHO feature.

TonyT · #19 08-16-06, 12:03

VLTOR: what is that supressor? it looks like it has a HOLO-type quick release mount. Thanks.....

Griz · #20 08-16-06, 13:52

Does anyone have experiance with the "National Magazine" AR-15 9mm mags at Midway? Does it activate the BHO? Feed reliably?

http://www.midwayusa.com/eproductpag...eitemid=933969