Results 1 to 11 of 11
-
28 May 2016, 12:04 #1Senior Member
- Join Date
- Apr 2014
- Posts
- 534
- Downloads
- 0
- Uploads
- 0
Surefire muzzle brake beveled shim
Anyone know what happens if you don't use it? I recently had 2 socom muzzle brakes installed and pinned on 14.5" barrels. The dealer said they install as per surefire's directions. Obviously the beveled spacer wasn't used or I wouldn't be here asking. I sat on Hold waiting for Surefire to pick up the phone for 10 minutes then 12 minutes then 45 minutes with no answer. Maybe they had a long weekend as this was Friday.
Thanks
BillLast edited by n4p226r; 28 May 2016 at 12:26.
-
28 May 2016, 12:06 #2
-
28 May 2016, 12:24 #3Senior Member
- Join Date
- Apr 2014
- Posts
- 534
- Downloads
- 0
- Uploads
- 0
-
28 May 2016, 12:26 #4Senior Member
- Join Date
- Apr 2014
- Posts
- 534
- Downloads
- 0
- Uploads
- 0
-
28 May 2016, 12:37 #5
Ok, I get what you mean now.
I've got several installed this way, I've run into zero issues shooting them suppressed and unsuppressed.
-
28 May 2016, 13:28 #6Senior Member
- Join Date
- Apr 2014
- Posts
- 534
- Downloads
- 0
- Uploads
- 0
Good to know. I couldn't think of any reason why it wouldn't be ok but I figure better check before blowing up a can I can only visit every few years
-
28 May 2016, 13:52 #7
The potential issue is that the main shim (with bevel) sets a uniformly square surface for the MD (and shims) to seat on when installed. Most 5.56 barrels have the shoulder below the threads, so the beveled spacer accounts for that. Personally I would be a little upset if they hadn't been installed (assuming you had a shouldered barrel), but it would make me feel a little better knowing UWone has shot suppressed without any issues.
-
28 May 2016, 14:18 #8Senior Member
- Join Date
- Apr 2014
- Posts
- 534
- Downloads
- 0
- Uploads
- 0
What's the shoulder?
Being upset and cutting $260 in brakes that are pinned are two different things. I'm more worried that the second was needed.
-
28 May 2016, 14:20 #9Senior Member
- Join Date
- Apr 2014
- Posts
- 534
- Downloads
- 0
- Uploads
- 0
http://img.photobucket.com/albums/v2...pspwuueqep.jpg
Here is one of my other barrels. What part of this does the spacer fix?
-
28 May 2016, 17:10 #10
The beveled shim is not always needed. Some barrels have a small radius from the threads to the shoulder. This prevents a muzzle device (or regular shims) from resting flat against the shoulder.
It's very easy to tell if you need it. Thread a muzzle device on with no shims until it stops, then hold the barrel up with a light behind it and see if there's a tiny gap between the muzzle device and barrel shoulder.
If there's a tiny gap and light is coming through, then you use the beveled washer with the bevel facing towards the rear of the rifle, followed by normal shims to time the muzzle device.Will - Owner of Arisaka LLC - http://www.arisakadefense.com
-
28 May 2016, 21:55 #11Senior Member
- Join Date
- Apr 2014
- Posts
- 534
- Downloads
- 0
- Uploads
- 0