AR newbie ?'s

[sigma 40ve]

I am new to the AR platform. I have 1 S&W AR now.

Anyway, here is my question--I have been considering a 9mm AR for awhile. A friend at work told me he was going to be getting rid of a couple of his guns. I asked him what they were. One is a Rock River 9mm. He said he got it from a dealer that usually only handles RR's. He said it had a special stage trigger in it, that was different from the regular triggers. And the dealer told him it could be swapped out to 223 by ONLY changing uppers. no other part changes were necessary. Does this sound right?
He has shot about 500 rds thru it he said without any problems.

Here is the "deal"--RR AR 9mm carbine with fixed front sight, rear fold sight, Hogue grip, 3 Uzi mags, EOTECH that uses AA batts and 400 rds of WWB. The EOTECH was bought with the carbine. Price is $950, worth it or not?

If it is worth it, what are the pluses of having a 9mm verses a 556 AR, if any?

TIA,
sigma

 

[Acera]

I would consider that deal. The RR probably has a magazine block that shrinks the size of the magazine well to handle the UZI mags. They usually come out fairly easily. Then you can insert a regular 5.56 mag., coupled with an upper, and possibly a bolt group (and maybe a new recoil buffer and spring, someone else will have to fill us in on this) as your friend said, you are ready to rock and roll. As far as having a 9mm over the 5.56, hey it's something different, and might be fun to shoot. The 9mm has less penetration possibilities for an urban environment than the 5.56. Colt originally built their version to compete with the MP5, UZI and other small entry/SWAT type guns. It has a place in the shooting world. Go for it, you can always sell it if you don't like it for probably as much as you paid for it.

 

[Mtdew]

I have two 9mm AR's. One is a standard 16" midlength and the other is a 5.5" "SD" I'm going to build a 9" (DOEish) soon as well.

They are fun to shoot, and ammo is cheap.

The 9mm buffer works fine with 5.56. If it's a 9mm hammer you will need to swap to a DPMS or bobed M16 hammer to be able to swap between 9mm & 5.56

Thats cheap if it's a real Eotech

 

[lamazza]

I think RR 9mm have proprietary mags and you cannoy use Uzi mags. I may be wrong. I think the Oly arms 9mm conversion is the one with Uzi mags.
Its worth finding out for sure because the 'made for' 9mm mags are hella expensive.

 

[Jorg Nysgerrig]

Sigma, take a look a this:
http://www.rockriverarms.com/images/rra9mm.jpg

 

[Mtdew]

I think RR 9mm have proprietary mags and you cannoy use Uzi mags. I may be wrong. I think the Oly arms 9mm conversion is the one with Uzi mags.
Its worth finding out for sure because the 'made for' 9mm mags are hella expensive.

RRA takes uzi mags w/ a extra mag catch slot. It is a colt based setup so it will also take colt, CP & pro mags.

The Oly 9mm system takes modified sten mags. Their 45acp used modified 45acp Uzi mags

Sigma, take a look a this:
http://www.rockriverarms.com/images/rra9mm.jpg

The 9mm buffer works in 223

If the bolt is ramped it can use any hammer. If it isn't, ONLY a DPMS or neutered M16 hammer can be used w/ both 9mm and 223 uppers

 

[Zen21Tao]

I have a 9mm AR that uses sten mags. That is actually a great deal, especially if it comes with the 9mm bolt/carrier/charging handle and magazine block ($100 and $125). The "special" trigger is probably the RR national match trigger (about $150 new). The 400 round of Win ammo is selling online for ($150-$200). The EOTech, if real, is probable between $300-$400. If it is an EOTech "type" knockoff, you are still looking at a $75-$150 sight. So, I would say definitely buy it if you can.

As for the pluses of a 9mm carbine. Many indoor ranges are handgun calibers only, in which case you can use the 9mm carbine but not the .223. Also, the 9mm Carbine makes a better home-defense option if you have to be concerned about a .223 round penetrating walls (such is the case if you live in an apartment). Also, if you use a 9mm handgun as a defensive/concealed carry weapon, you would have a defensive rifle that shares the same ammo.