The Bone Collector is the best of the Gamo plastic air rifle line. The last two releases are batter than the original version, however, Gamo caused confusion in the marketplace by not distinguishing between the first & second Gen rifles. This was settled with the Maximum line.
I was not a fan of Gamo until I used this rifle. They were the first to introduce plastic triggers, thin tube barrels shrouded in thick poly - falsely called "Bull Barrels", publish highly exaggerated (lying) pellet velocity & marketed useless, potentially damaging too-light alloy pellets to a break barrel market. Then they bought the BSA air gun line & immediately began to ruin its traditionally good name.
I decided to give this rifle a chance when it was on clearance at Walmart. It also had a couple new innovations I was interested in trying for myself. Namely the "recoil reducing rail" scope mount & the "CAT custom action trigger". More on these features later but for now, the short version, it became my go-to pest rifle. A picture's worth ...
Back to the RRR (recoil reducing rail) & CAT (custom action trigger) - In the old days, like when air rifles were made of wood & steel, a "scope stop" was used. Picatinny rails had not yet made it to the air rifle world, so a 3/8 dovetail groove with a fixed block at the rear mount would prevent scope movement. Gamo brought back that concept but added a recoil absorber to lessen the shock to glass on recoil stroke. Note the barely visible nylon rod between the stop & rear mount. A nifty idea & functional since that REX scope is not airgun rated but has held zero for 2 years of regular use. CAT trigger up next.
The CAT trigger, in certain regards, is probably the best trigger offered by the big 3 airgun manufacturers - Gamo, Umarex & Crosman. It's the only one which is adjustable for pull weight. Mine is set just under 3 pounds pull. It breaks very consistently too. The two downsides are, it's made of plastic & there is a single screw to adjust both first & second stage take-up.
The CAT is distinguishable from the older SAT (smooth action trigger/not pull weight adj) by the three scallop holes, which does look kinda cool. It does NOT have an automatic safety (I loathe those) so it make a good hunter.