7075 Aluminum construction
Very smooth at first glance inside
Excellent groupings and accuracy, very tight.
A bit tight in some hopups or buckings, nothing too serious, fixable with a bit of silicon spray
I would buy it again, if I had another gun.
Notes: About 3k bbs put through it with excellent accuracy.
Installed inside a G&G GR16 Blowback with a Bravo Metal hopup and stock bucking and nub.
(Stock green bucking slid on nicely and into the hopup with ease without spray)
Rating: [5 of 5 Stars!]