Brass shavings stuck in firing pin hole!!

[ganderman]

I have a SA Ultra Compact in 9mm with only about 400 rounds through it. I am only getting the shavings when firing brass cased ammo and am finding no real scrapes or dings on the casings. I am getting some light scratching on the front 2/3 of the casing like I have a really tight chamber. Is this building up somewhere? Help!!

Question two. I just bought a series 70 Colt in .45. It has a barrel bushing with 4 petals on it that grip the barrel instead of just being fitted to it. The barrel is also larger at the end than the middle. Just wondering what the heck this setup is since its not like any 1911 I've ever owned. (also quite accurate so whatever the hell it is works)

Thanks,

ganderman

[Bud White]

Its a collet type bushing ya have to watch for the fingers to break though . When they do it will tie up the gun and is a pain to get apart ...

As for the other question i really cant say to much with out seeing it

[rmw]

You are probably shaving off a little piece of brass every time you feed a case up the breech face . If you chamfer the upper half of the fp hole it should go away . Take a look at the breech face of a 226 there will be a small chamfer around the fp hole , then look at a Beretta 92 they kind of take it to an extreme

[Harlie]

Breach face, look for roughness, protrusions at firing pin hole, and check for pressure signs at the primers (Primer flow). Brass slivers can cause serious problems, by blocking firing pin, either in or out.

[ganderman]

Looks kinda like primer flow. It does this with all ammo fired except Wolf. What causes this?

ganderman

[rmw]

Does the wolf ammo have a steel case ?

[ganderman]

Wolf ammo has a steel case.

ganderman

[rmw]

That's probably why it works , go somewhere where you can safely feed some rounds threw your gun "brass cased" and see if the fp hole shaves the brass

[ganderman]

The firing pin hole does not shave the brass on the primer. When the gun is fired, brass from the firing pin blows back into the fp hole. Not sure why it does this. I believe Wolf ammo is also berdan primed.

ganderman

[Harlie]

Is boxer primed, primer flow is usually a pressure indicator, oversized firing pin hole? If you are getting brass shavings from Wolf ammo, it has to be from the primer it's self. The casing is steel. Would suspect breach face and/or firing pin hole as culprits. Seek some G'smith advise and correction, is my suggestion. This can cause a failure and if used for defense, not acceptable. Wolf can be reloaded as well, but that's another story for another time.

[briflemn]

"Question two. I just bought a series 70 Colt in .45. It has a barrel bushing with 4 petals on it that grip the barrel instead of just being fitted to it. The barrel is also larger at the end than the middle. Just wondering what the heck this setup is since its not like any 1911 I've ever owned. (also quite accurate so whatever the hell it is works)"


The collet bushing was popular with Colt for awhile. OK on a match gun as long as you change the bushing fairly often. The fingers tend to weaken with time and eventually break.
My feeling is they were an inexpensive fix for poor fitting. A well fited barrel/solid bushing/slide assembly is a much more durable option and at least as accurate.

[vinconco]

Several IPSC shooters along with myself had the firing pin shaving problem and solved it by making a new firing pin to fit the hole in the breech face. We used old lawnmower exhaust valve stems.... great metal for this use. A closer fit prevented primer material from flowing into hole.
Another fix may be lighter loads and harder primer cups.