This is as short as you will find for an AR15 pistol buffer system. AND this buffer lets you use ANY standard bolt carrier. Just remove your existing pistol buffer tube etc... And put this one on. It is like new. It was mounted and test fired about 20 rounds then removed. If you want it, text me an offer to 78five475seven39O. Would consider trading for an optic/scope like a fixed power, ... a 4x32 or something similar. If you have an AR15 pistol then you know what this is. If you want one of the few super short ar pistols then here is your chance.