Not much that I could tell at 50 yds. I haven't had a chance to shoot it at 100 yet.
Not much that I could tell at 50 yds. I haven't had a chance to shoot it at 100 yet.
My major first hand experience with a difference in muzzle devices was between a standard A2 and FSC556.
First started with a BCM middy, 12" lite rail, used an Aimpoint to zero with AP and A2 zeroed at 100 and remember having about 2" group, average.
Talked into a FSC556, put it on and I was 5" off at 25! low and right. I zeroed it and later got a Nightforce 1-4 w/CQB reticle. I could not do better than a fat 3" at 100
I put the A2 back on and zeroed at 100 with the scope--moa
All three times muzzle devices installed with crush washers, new ones. All ammo was 55 grain ball.
That's my experience with impact shifts and accuracy changes. Nothing scientific, for or against a product, etc
Pretty sure he means "turned" as in on a lathe. A properly-equipped machinist can remove material from the barrel, in effect lengthening the distance from the barrel shoulder to the threads in such a way that when the muzzle device butts up against the shoulder, it will be indexed in the correct position.
The front edge of the barrel is shortenend a tiny bit to allow the muzzle device to line up correctly with no washers (crush or peel). My Benny Hill Rolling Thunder is that way.
http://img.photobucket.com/albums/v4...0album/003.jpg
Well shit... I feel like a douche-bag now:p Although as I read crazymoose's comment above, I instantly remembered reading in my surefire suppressor attachment instructions that the "optional" method for gunsmiths is to do just that. I just completely forgot about it... even though it was only 2 weeks ago.:D
Thanks for the clarification though, guys!
Semper Fi,
-Paul
Funny, I installed one of those about a month ago, that's how I learned about it. After dicking around with those shims for over half an hour trying to get the torque just right, only to find that applying Rocksett seemed to alter the timing when it had been lined up perfectly, I think the machining method might actually be easier to someone with the skill and tools.