AR15 firing pin retaining pin

[FA9]

What would cause the cotter pin to break? I would say an estimated 200-250 rds on bcg.

Read More

 

[Medic!]

A punctured/blown primer?

 

[Capn Jack]

What does the tip of the firing pin look like ?
Is it burned and pitted?

 

[FA9]

A punctured/blown primer?

What does the tip of the firing pin look like ?
Is it burned and pitted?

Firing pin looks fine, but when I took out the cotter pin guess what? Another broken cotter pin.

I'm shooting my reloads(cci primer, mixed headstamp brass, 26.1gr cfe223, 55gr fmjbt chronyed @2759 fps out of a 16in barrel.

 

[rick benjamin]

Wondering if there's a batch of cheap aftermarket retaining pins out there?
Should be made from hard steel and heat treated.
Don't bend, spread, etc.
Never force, it should slide in.
Wonder if heat treatment was omitted in a batch?
Recently one broke and jammed the gun
Also saw a gas port screw break off recently.

 

[FA9]

Wondering if there's a batch of cheap aftermarket retaining pins out there?
Should be made from hard steel and heat treated.
Don't bend, spread, etc.
Never force, it should slide in.
Wonder if heat treatment was omitted in a batch?
Recently one broke and jammed the gun
Also saw a gas port screw break off recently.

Hmmm that's what I'm wondering. I got 2 pins from a friend, and he doesnt know where they came from. I'm thinking of buying this http://www.cheaperthandirt.com/product/2-KNSPERMA but $7.50

 

[rick benjamin]

Considering the carbon build-up in the bolt carrier
Ought to field strip it every day
Inspect the carrier, bolt gas rings, bolt face, extractor, firing pin, retaining pin.
Scrub, scrub scrub.
Maybe a contributing factor was dirty jammed firing pin?
Scrub Scrub Scrub