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Posted: 12/14/2003 8:22:33 AM EDT
I'm in the process of making a decision on barrel length for a 9mm Rock River Arms upper for my M16. My intention is to use a 9mm suppressor with a 4 or 5 inch barrel (I will be using an AWCMK9 with a quality thread adapter made by Socom). I'm going for the "SD" look.

Before I decide on barrel length, I'd like some input. My questions are:

1) Will there be a compromise of bullet stabilization at 4 or 5 inches (versus longer barrels)?
2) With regard to stabilization, is there a difference between 4 and 5 inches?
3) If 4 or 5 inches is perfectly sufficient, how short is too short?

I don't want to find myself with accuracy issues (sporadic patterns) or baffle strikes because the barrel is too short.

Thanks in advance,
Link Posted: 12/15/2003 6:58:51 PM EDT
[Last Edit: 12/15/2003 7:02:41 PM EDT by Kaliburz]
[url]http://www.villagephotos.com/viewpubimage.asp?id_=1804822&selected=185637[/url] Look at that thread and contact those guys. Not sure how long the barrel is, but it's close.... [img]http://img.villagephotos.com/p/2003-3/64578/TCFRQSTASDQLSPBYDZOV-DSC00099.JPG[/img]
Link Posted: 12/15/2003 7:14:20 PM EDT
I just got a 4.5" bbl from Kurt's Kustom Firearms, and it surprised the hell out of me. The first 3 shots at 25 yards went into the same hole! I wouldn't worry too much about accuracy in a 4.5"; I can't speak beyond that. I also don't think there's a lot of point in making it shorter. That barrel comes right to the end of the Shorty FIRSH model; it looks great!
Link Posted: 12/16/2003 3:42:48 AM EDT
Thanks for the feedback! fizassist, I'm assuming reliability on your 4.5 inch upper is unaffected. Any pics of your setup? Thanks, Dan brownhen@ix.netcom.com
Link Posted: 12/18/2003 4:30:47 PM EDT
Originally Posted By Dan0341: fizassist, I'm assuming reliability on your 4.5 inch upper is unaffected.
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Correct. A blowback upper should be pretty insensitive to bbl length compared to a gas operated one.
Any pics of your setup?
View Quote
Link Posted: 12/19/2003 4:27:57 AM EDT
Dan; The very same ammo is being shot in pistols with 3, 3.5, or 4 inch barrels every day. They may not offer the same accuracy as a shoulder-fired firearm, but there's sure no problems with bullet stabilization. Go ahead with your shorty and enjoy it. As long as the threads (or other attachment device) on the muzzle are done properly, you won't have any problems.
Link Posted: 12/19/2003 5:43:50 AM EDT
Dan0341, My 5" barrel was made by Dr. Dater of Gemtech. It was originally threaded 9/16x24 and then I wanted to go 3 lug and Dater chopped made it a little shorter. So now it is 4 something inches long. It is very accurate. I use it for smg competitions. The outdoor range I shoot at only allows FA at the 20 and 40 yard plinking range. I can easily hit anything I want at the 40 yards. Some of the guys I compete with have dropped their 10.5" 9mm uppers and now have gone with the ~5 inch barrel setup like I have. One guy commented to me that it is way more accurate than his 10.5" setup. [img]http://home.cfl.rr.com/c3stuff/m16/colt_curved.jpg[/img]
Link Posted: 12/19/2003 3:15:47 PM EDT
Why will you need a thread adapter? Most any thread can be turned on the end of heavy 9mm barrel. I just finished this for a guy who is doing the same thing you are. We made him a barrel 5.375 long and threaded it to 3/4X10 to use his M11 can. He is going to put a 12" free float hand guard on it and the 12 inch suppressor will stick out the end of the hand guard about 3.5 inches. Should look very cool when finished. Mike @ TSC CO. [img]http://img.villagephotos.com/p/2002-11/64578/work019.jpg[/img]
Link Posted: 12/20/2003 8:04:40 AM EDT
[Last Edit: 12/20/2003 8:06:41 AM EDT by Dan0341]
Thanks to everyone for the info. Mike, nice job on the threaded barrel. I'm going with the adapter for a few reasons: -I've had the adapter for over a year for use with my 22lr kit (and it will work with the 9mm upper) -I like the thought of using a Rock River Arms barrel as everyone speaks highly of their quality -since I already have the adapter, it will probably be cheaper overall just to cut and thread the barrel 1/2x28 then have someone make a cutomized barrel -I like the idea that I'll be able to remove the adapter and replace it with a muzzle brake or flash hider when shooting without the suppressor. Here are a few pics of it: [img]http://home.netcom.com/~brownhen/sitebuildercontent/sitebuilderpictures/endofadapter.jpg[/img] [img]http://home.netcom.com/~brownhen/sitebuildercontent/sitebuilderpictures/sideofadapter1.jpg[/img] [img]http://home.netcom.com/~brownhen/sitebuildercontent/sitebuilderpictures/adapterattached.jpg[/img]
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