Rick, I put the breech on the tube, bolted it in the back, clamped the front and drilled the holes. Easy deal………The hard part is getting the burrs out. The ones I made were easy, but the factory burrs are another story.And I didn’t dress the threads on the new tube and tried to screw in the fill assembly. Ruined the tube and fill assembly. Idiot. More parts inbound.I just pushed a pellet through the barrel I replaced with a Walther. FTT 5.53, smooth all the way and a pretty aggressive choke. I will give it a good JB treatment and install it.The crown looks good too.My Wather barrel loves the FTT 5.53