I have had a couple for a while (a H2 and a Mega H2) and used one in particular a quite often. I also have 5 other DPT and a Waitaki Stainless one from my crushed naughty gun.
Apart from the dumb operator forgetting to actually lock it on with 1/4 turn and sending off downrange nearly 100m. It has been pretty much flawless.
Yes I also found the POI moved a little when removing and reattaching but not enough to cause a miss on a deer sized animal as far as I would consider my max range (350m).
It also seems to take one shot to settle after being clicked onto A-loc. Again not enough to cause a miss.
the A-Loc has never come loose. The loctite used was Loctite 638 which is not red in colour but green and what A-Tec recommend.
My A-loc was removed about 8 months ago by Joel at Stager Sport after a bit of discussion and then he permanently fitted it to the suppressor so it is now the same attachement method as most others. We also removed the "bush" from the rear. Now I have 100% repeatibility. Interestingly it does not shoot loose over the course of 5-10 consecutive shots like my other suppressors seem to do.
Now this on a gun I use exclusively on the range for shooting smallish steel plates so a small POI impact did cause me a bit of grief at time.
However I did not choose A-Tec based on the A-Loc feature but simply the MegaH2 offered the best noise reduction I could find at the time. The barrel does get quite hot under the over-barrel section of the suppressor after 5-10 rounds shot quickly.
Now after 1193 shots thru it it has some carbon build up in the first section but the rest looks like its almost new. I would / will be buying more A-tec. I use WD40 on baffles after every use.
Also Joel @ Stager spent quite a bit of time getting the A-loc off even though he has the tool for doing it, cleaning up the threads and Loctiting the A-Loc back into the suppressor all at NO Charge and while I waited. Outstanding service I thought.
They also sell replacement O-Ring/Grease Kits for them.
I think they get hard to detach from the A-Loc as when they heat up both bits expand gripping harder. if removing is difficult by hand I found using a oil filter removal stap wrench works with a helper holding the rifle firmly.
They are a very good suppressor I think.
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