Too short! - Tacfire AR15 Pistol Buffer Tube Kit

This buffer tube is too short. I measured everything multiple times after having cycling problems. My BCG would not lock back. I installed it without the spring to check clearance and it was about 1/4" short. I tried a different BCG and buffer. All roads point to the inside length. I made sure there was no interference from machining or other objects in the tube of which there was none. I wish I had returned it but my build was slower coming together than the 30 day return period.