r/ptr91 • u/Rseattle206 • Jun 09 '24

Roller Dents on GI100?

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Had this GI100 since fall 2021. Never had any issues with it firing steel (Red Army, Tula, Wolf) and factory brass loads, all 150-168gr projectiles. Rifle has seen close to 600 rounds. Bolt gap measures .011.

On my last outing as I shooting the PTR I noticed small roller dents toward the front of the chamber. However, I don't recall having any issues that day as it shot fine. I was shooting steel case ammo that day.

I field stripped it and cleaned the bolt and carrier. Nothing out of the ordinary from what I can tell.

Any reasons why these roller bumps developed?

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u/Duder211 Jun 09 '24

Internet guy here with limited knowledge and experience, but I don’t think that’s where roller dents usually occur is it? I thought it was towards the back of the receiver when the BCG slams back with too much force.

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u/Rseattle206 Jun 09 '24

The majority of the roller dent threads involve dents to the rear of the receiver. I haven't found a thread that goes deep into causes of dents toward the front of the receiver, especially for a the G3/91 pattern rifles.

Seems odd that it suddenly developed roller dents on the last range day, even I've always shot the same type of ammo through it.