It is a Bushnell Sentry II
SOURCE: Tasco 57T Telescope
set screws attach the lens and barlows. they are little silver knobs. you should also attach your barlows before the angle piece and lens for a clear picture
SOURCE: How do I remove stuck rear lens cap for telephoto lens on D3200
Are you sure you're turning it in the proper direction? Nikon lenses (and thus rear lens caps) screw in the "wrong" way. The lens cap turns clockwise to remove.
If it's an ordinary plastic lens cap, as a last resort you could cut it open with a knife.
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