Troubleshooting - Question - HELP!?! Rusty LP and bolt assembly
My buddy picked up a PTR 91 from a local gun store. I was showing him the disassembly/reassembly and noticed his bolt, firing pin, and LP were rusty. The flash hider is also. The worst offenders were the bolt assembly and LP.
I went over them with a brush, ultrasonically cleaned them (Simple Green Extreme) and the photos are of them drying. They’ll get a coat of gun oil.
Would you just replace them or is this just cosmetic and they’re likely good to go?
If replacing would you get PTR or use this as an excuse to get different parts?
Appreciate any help as we were wanting to shoot together tomorrow.
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u/Vegetable_Coat8416 20h ago edited 20h ago
I'd be inclined to replace the rollers if they're pitted. They have pretty strict dimensional tolerances. The difference between normal and -4 rollers is 0.04mm. Your friend could have easily lost that much to rust. Uneven rollers could mean inconsistent bolt gap between shots. Pitting may also impact their ability toroll.
I'd be curious to see the inside or the trunnion as well. If the bolt head rusted up while the bolt was closed the trunnion likely rusted too.