Thread: Suppressor rear bush sizing

Originally Posted by zeropak

My concern with that approach is that if the suppressor was to come loose on the threads while shooting there is a real rish of bullet contact with the baffles, the end result of that doesn't bear thinking about. Pretty sure this is the reason the bush is there.

No different to a muzzle forward, heaps of people running them without issue.

Originally Posted by Nick-D

No different to a muzzle forward, heaps of people running them without issue.

Good point

I vaguely remember DPT saying that the rear bush isn't necessary at all re: noise reduction. Don't quote me on that, I may have misremembered.

Hi,

The rear bush should have 0.05mm clearance, 0.1mm is fine. To confirm its not touching the barrel, firmly screw the suppressor onto the barrel, then unscrew the rear bush, if you feel the bush rubbing the barrel then the bush needs to be made slightly larger, if not then its fine.

The suppressor should have been supplied to you with instructions, the bush clearance is mentioned in there.

Originally Posted by DPT

Hi,

The rear bush should have 0.05mm clearance, 0.1mm is fine. To confirm its not touching the barrel, firmly screw the suppressor onto the barrel, then unscrew the rear bush, if you feel the bush rubbing the barrel then the bush needs to be made slightly larger, if not then its fine.

The suppressor should have been supplied to you with instructions, the bush clearance is mentioned in there.

Thanks for that. Yep should have read the instructions. I read them when I purchased my first DPT I remember the maintenance instructions and I follow them, it didn't occur to me the clearnce info woul be in there, my bad. Anyway thanks for the advice I will do that.

Ha, if all else fails read the instructions aye.

The bush serves to protect the mounting thread if the can gets a bash

Me personally prefer a fairly big clearance. I check my silencers regularly to ensure they haven't come loose.

I found my rifles to group better with the rear bush(s) not touching. Then again - I prefer muzzle forward silencers.

Another vote for not running a rear bushing. My DPT on the 7mm08 M7 been fine without it.

The bore is concentric at each end but is frequently eccentric between those points due to barrel straightening after profile turning. When I machine a muzzle I first check the bore for straightness and correct it if needed before turning and threading the muzzle between centres. I then clock the OD of the barrel at the rear bushing point and note any runout. I can then calculate the correct bushing size with a minimum size that will not exert any eccentric pressure. Bushing contact on an eccentric OD can cause accuracy problems, especially as the barrel heats up. A true concentric barrel will shoot better with the bush in contact.

Exactly what I was saying earlier but most on here know best ha ha