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A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the hole diameter, and a chamfer on either one or both ends to facilitate starting the pin into the hole. The spring action of the pin allows it to compress as it assumes the diameter of the hole. The force exerted by the pin against the hole wall retains it in the hole, therefore a spring pin is considered a self retaining fastener.
Spring pins may be used to retain a shaft as a journal in a plain bearing, as a type of key to fasten one shaft to another, or to precisely fasten flat faces of mating parts together through symmetric hole locations.
Title pretty much says it just looking for a few small parts. I have a carbine length tube to trade and a few other small parts. Just looking to finish a build and thought i would try the community.
PS don't tell anyone I have an AR15 or two, remember comrades rifle is fine.
I bought an Aero Precision Upper Receiver and it comes with an allen head screw instead of normal roll pin. Do I need to put any thread locker on the allen screw? I have always had to put a roll pin the secure the forward assist this is my first experience with an allen head bolt.
I ordered a gas tube and it says the roll pin is included but there wasn't in the package. Can I go to the hardware store and buy an appropriate sized buy one? I have a few spare extractor roll pins but they are too large. I have fewer lower parts kits does anyone if roll for the lower kit will...
Looking for possibly a few of these. I would like to keep it to good quality, reputable parts. Would like to be within reasonable driving distance of Gresham or if they can be mailed, I can Paypal you.
Would buy online but I don't need anything else and flat rate shipping makes it not worth it.
I'm looking specifically for the sear housing "coiled spring pin". Its the very most rearward pin in the FCU. Apparently I lost it at some point and now I'm ready to do an apex trigger upgrade but need that pin to complete it. The Sig site has it (2.5mmx20 coiled spring pin) for $5 with $10...