Reddit reviews Nylon 6/12 Round Rod, Opaque Off-White, Meets ASTM D5989/ASTM D6779, 1/4" Diameter, 3' Length
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Nylon 6/12 offers excellent wear and abrasion resistance and has a low-friction surfaceNylon 6/12 absorbs less moisture and provides greater dimensional stability than nylon 6/6Color is opaque off-whiteMeets ASTM D5989 and ASTM D6779 specifications
So something like this would be good to make bolt buffer pins?
Nylon 6/12 Round Rod, Opaque Off-White, Meets ASTM D5989/ASTM D6779, 1/4" Diameter, 3' Length https://www.amazon.com/dp/B00EVD1TSO/ref=cm_sw_r_cp_apa_aAMvxbN93FEQ9