So I have a slight bullet scrape on the front endcap of my Spectre 2.  I had just shot it on a Kimber 1911/22 conversion after shooting it on a Savage .22 rifle.  A little green paint on the endcap exit hole and the culprit was found (the Kimber).   Kimber has a threaded adapter on the end.  The green paint had just barely been wiped on the endcap after firing three rounds of .22 subsonic.  Some paint was still there, but obviously the bullets were scraping.  No baffle strikes.

So other than a trip to yell about the thread job, would it be prudent to simply have the endcap opened slightly or wait until a new barrel adapter could be made.

I personally feel you shouldn't use adapters at all.  Pay for a threaded barrel

I would not modify the endcap. Instead focus on the root cause of the problem.

Adapter was made by a local gunsmith.  The factory barrel did not have enough length past the slide, so it was threaded (don't remember that thread pitch offhand) and an adapter that had the 1/2x28 thread for the suppressor was installed.  The suppressor seats squarely on the shoulder and the thread length is correct.

I'll leave the end cap alone and see about getting another adapter made.  I don't think there's a .22 bbl for the Kimber conversion that would ve long enough to directly thread.  But I've been wrong before. . . Perhaps my search engine skills need honing.    

 

Gunsmith found a slight high spot on the adapter shoulder.   He's going to fix it.