Ordered Part # 121411 long nosed stapler for upholstery, set my compressor @ 70psi (recommended by Sailrite) equipped with #8010GZ 3/8" staples. Would only drive staples 1/2 way; increased PSI to 100--no difference--increased to 125--no change. Went back to my regular stapler- worked perfect. Unfortunately I was away and missed my 1-month return window, and am stuck with $100.00 worth of something I can't use. Can only use Sailrite staples. I was working on a soft wood chair ; cloth upholstery--not a hard wood. To any one thinking of purchasing this gun for upholstery--DO NOT!!!!! Might work for leather or vinyl car seats????????? User's recommendation: Don't waste your money.