The QB-57 is a higher quality, wood & metal air rifle than the polymer framed Roebel, and it has a muzzle velocity of 480 fps with 14 grain lead pellets, which is quite a bit more powerful than the Roebel, which shoots 7 grain lead pellets around 450 fps.
I bought the Roebel B6C from a surplus store in and it was missing a breach seal, so instead of returning it I tried a half inch faucet washer, which fit perfectly and provided a decent seal.
It has a front post sight that is adjustable for elevation, and a less than steller rear notch sight. It would have been better with a peep sight.
I drilled a hole in the middle of the polymer carry handle and now can attach an AR15 picatinny rail or scope rings to improve the sights on this air rifle.
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