PSA has everything you need to complete your AR-15 build, including aftermarket parts, accessories, and more! Strike Industries AR-15 Shift Pins offer convenience and innovation. Quick Detach mechanisms result in not needing to remove your stock assembly (endplate, castle nut, buffer tube, etc.). SI Shift Pins also feature an extended trip surface for quicker disassembly without a need for a pin punch - simply rotate the pins for removal. When paired with SI detent pins, swapping pins is a very painless task!