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Posted: 1/11/2005 12:59:56 PM EDT
I want to build a SBR 9mm AR. I'm leaning towards the Colt/RRA-style upper. Does anyone offer this as an SBR upper (like around 7.5"), or will I have to buy a regular 16" upper and have the barrel shortened ?
Link Posted: 1/11/2005 1:49:46 PM EDT
Buy a 16" and have it shortened. Only other option is make from blank to your desired contour.
Link Posted: 1/11/2005 1:50:37 PM EDT
J&T has a 10" 9mm upper that is very nice...plus you can get it as a flattop.
Link Posted: 1/11/2005 3:08:08 PM EDT
Or you could build up a 9.5" or a 5.5" using a 3-lug barrel from www.trosusa.com



Link Posted: 1/11/2005 3:24:31 PM EDT
[Last Edit: 1/11/2005 3:43:51 PM EDT by StealthyBlagga]

Originally Posted By SBR7_11:
Buy a 16" and have it shortened. Only other option is make from blank to your desired contour.



If I cut down an RRA 9mm barrel, I assume the functioning will be the same regardless of barrel length, as it is a blowback system (not gas operated) ? I really want to go very short, like 7.5" or less.

ETA: The barrel shown on the RRA website is of a "Govt/M4" lightweight profile under the handguards. Can anyone here who owns one of these uppers confirm this is correct ? If so, I won't be able to cut the RRA barrel much shorter than ~10".
Link Posted: 1/11/2005 3:57:42 PM EDT
[Last Edit: 1/11/2005 3:59:24 PM EDT by bjgunner]
The RRA barrel is 5/8" under the handguard. You can cut it off a 6" or less if you want. Mine was cut to 6" long and then converted to an integral upper.
Link Posted: 1/11/2005 4:56:13 PM EDT
I made mine @ 5 1/2" and it runs fine. I cut down a 16" barrel and threaded it.



Link Posted: 1/11/2005 5:17:08 PM EDT
Joe, That's freagin awesome! When my SBR stuff arrives, I will be doing a 7 1/2" cut down with the 3 lug and MP5 hider. The handguard will be a DD 7.0 with LMT fixed rail mount sight.
A side note, I ordered a Vector UZI today, so I will be getting that cocking lever from you and a railed forend later!

Mark
Link Posted: 1/11/2005 8:45:34 PM EDT
[Last Edit: 1/11/2005 8:47:46 PM EDT by GIDDS-45]

Originally Posted By StealthyBlagga:
I want to build a SBR 9mm AR. I'm leaning towards the Colt/RRA-style upper. Does anyone offer this as an SBR upper (like around 7.5"), or will I have to buy a regular 16" upper and have the barrel shortened ?



Hacksaw and Birchwood Caseys Flat Black Pen.....


Just kidding....by an RRA or other good 9mm upper and send it to (there are more than one reputable guys here that can do this) KKF and have it cut and re-crowned......after you register your lower, of course......I am a 7.5" fan, some will recommend 10"s.....good luck

Edited to add.....I wish I had some cash to send to Joe Black for numerous projects.....
Link Posted: 1/12/2005 5:26:48 AM EDT
ADCO told me if I bought a RRA upper through them, they would cut it for something like $50 (not sure exactly the amount)

Richard
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