Thread: Suppressor-over barrel or barrel forward

Originally Posted by Ground Control

Not to sidetrack the thread , but is anyone making an overbarrel to fit the Tikka T1x rimfire ?

The only overbarrel rimfire suppressor I'm aware of is the Hardy.
Most folk just use forward ones due to them being so much smaller than centrefire suppressors.
I use a DPT on my 16" T1x, and with all 5 baffles it's still the shortest rifle I own.

Hi,
Regarding the rear bush touching debate: we are fitting about 1500 of our suppressors per year on customers rifles( and not counting the 3500 other suppressor we sell to shops and public who get them fitted by their own gunsmiths).
We would probably investigate a dozen accuracy issues a year. And in most cases ,it is the rear bush being too tight around the barrel which causes the problem. I can not speak for other manufacturers designs, but that is what we found works the best with our over barrel suppressors.
Barrel outside countour concentricity to bore concentricity goes from excellent ( tikka,Sako....) to shocking (Asian productions and certain American ones....) , so much that we have seen up to 1.8 mm of outside concentricity. In those cases we set up and thread the barrel concentric to the bore, with a reasonably tight tolerance thread, boring out the rear bush till we do not have any more stress applied sideways by the rear of the suppressor onto the side of the barrel ounce screwed on. We have not found any negative effects on accuracy proceeding that way.
As to rattling issues against the barrel with the slightly loose rear bush, again our suppressors due to their design construction are less noisy than some manufacturers single tube overbarrel design, and we don't notice nor have reports of those issues with our products.

So, do you mean you have a clearance between bushing and barrel or is it touching/interference ?

It is touching the barrel from nearly 100% in the best barrels to maybe 20% in the worst cases depending on how much the barrel is bent or out of concentricity.

Hi Tuukka ,

Have a good Xmas mate & a happy new year .
Its been a long time ago that we shot the SMGs at the gun shop .

Yours Chris

Forgot to reply to this earlier but just wanted to say cheers for all the advice guys. Ended up going for the dpt over barrel. However instead of fitting to the old savage ended up buying a new rifle at the same time. I know its not everyone's favourite gun but bought a tikka t3 and am getting the suppressor sorted. However seeing as I'm currently trying to recover from rather bad back injury have no idea when ill be able to use it.

Once again thanks for the advice

Originally Posted by ChrisF

Hi Tuukka ,

Have a good Xmas mate & a happy new year .
Its been a long time ago that we shot the SMGs at the gun shop .

Yours Chris

Hi Chris,

Sorry for not catching your message earlier, hope you had a good holiday period!

Yes, it has been a long time since then, was not even working at Ase Utra yet at the time.

Tuukka

Another reason to run -definite- clearance between the rear bushing and the barrel is to prevent a changing zero when the suppressor is refitted. I was advised to do this by various experienced gunsmiths on a UK forum but my gunsmith at the time was of the opinion it wasn't needed. He fitted with barely perceptible clearance and sure enough, the zero would change annoyingly after refitting. At my insistence, he cut more clearance and the problem went away.

I had my current gunsmith fit a DPT to my old Rem VS (heavy barrel) .223. With the can fitted exactly concentric with the last ~3 inches of the bore, the bush taken down to minimum dimensions was still an interference fit with the barrel and he ended up having to skim about 1.5mm off the barrel down at the rear end of the can to get clearance. That bore has a shocking curve in it but is still a great shooter.