Only the trigger unit and open iron sights from a Chief will interchange with a QB sized tube...the air tube on the Chief is way fatter (and everything inside or on the ends larger).
Joe, This looks like a nice simple and inexpensive LCD for the Varmint. I went ahead and ordered the parts from Crosman so now I have to fabricate the adaptor. The LCD that came with the Varmint does not seem to do much. I was in the process of making one using 7 of the Marauders baffles but this is a simpler approach. Bob
If I ended up ordering those parts for the LDC from Crosman I'd probably triple the order and save on the shipping for future LDC'sThe one that I have on my Varmint is really nice, it's carbon fiber, I never did compare the weight difference between it and the stock one but in my hand it felt about half the weight.