I have a pdf, but it is too large to post. Search for DSBR-515.
https://support.crosman.com/hc/en-us/article_attachments/202502910/30060__30063.pdfSame as the MTR77. Try the above.
the mtr77np is that dpms gun, with a nitro piston. The TR77 is also a breakbarrel "tacticool" looking rifle, available with a spring or a ram. The the MK177 is a pellet/bb pumper based on the 2100 i believe, that looks like a SCAR.
sweet!!! now give it a good tuning and cleaning and get out there and see what they can do.
is the action loud? or the report? try shooting a heavier pellet... it generally quiets down the bark.