I got the set and was completely excited about using it. Then I opened the box and saw to my dismay, that although asgi did an excellent job of packing the product, that it was originally encased in a thick plastic/vinyl bag instead of a box or tube... I was very worried that the inner barrel may have bent, as I have had madbull python's bend in the past.
I was happy to find that it was not bent, proceeded to install it (took all of 45 seconds or so) and began my testing. I fired this on propane, chronoed and did accuracy tests.
I am very very pleased.
Still allows 1911 to be used with Serpa holsters when used with a blackside silencer.
Raises fps from around 320 to 390 with .20's (also chrono'ed separately with .25's, went from 310 to 375). All tests done with propane.
Increases accuracy (marginally in my opinion)
Increases range (significantly more than accuracy, so effective range is still somewhat less than a full size rifle, but far enough to be used in large scale outdoor games)
Hopup is easily adjustable and sensitive. Also easy to turn the dial, but it holds wherever you put it.
Poor quality stock packaging, inner barrel could easily be damaged in shipping or handling.
Requires a silencer be used to cover the inner barrel.
My gun didn't come with it stock.