Here are 2 pics of the receiver end of my barrel. The entire barrel needed a couple thousands off and inside the breech needed an oring installed to go around the probe or bolt. Factory barrels are threaded on the end to screw on the air splitter but this just has a thick washer with oring on the outside fastened to barrel with 2 set screws. It really doesn’t seem like that much machining to me
Each and every type or model / make will be different in terms of what needing to be done in taking a "Blank" and having it become "drop In" ready.
Thanks, that helps. It might not seem like much work, but as someone earlier posted, set up takes a considerable amount of time in many situations. I’m fairly new to PCPs, I bought a Marauder last summer and also have an HW95 and a couple pump guns. I have been doing some basic mods, but it’s interesting to see how other guns are put together.
Thanks, I have the equipment for all of that, so that is no problem. I just started in the PCP world last summer with a Marauder and was a bit surprised at the lack of info that is available on the different guns. Do you need to have the gun in hand to reverse engineer the barrel profiles in most cases, or are there drawings available like with Remington, Savage, etc barrels for powder burners? I’m not interested in airgun smithing at this point, the prices I have seen for parts online is low enough that I would rather do other things that pay better, but having spent several decades in engineering, I constantly gather information that may be useful in the future.
www.midwayusa.com 
