ALL TYPES OF MOUNTS BOTTOM PLATE -Mounting brack- ets cracked, holes not round; plate dented, cracked, bent; breech lock cam loose, has too much play (should float slightly) binds; cotter key or safety wire broken, missing; nut, spring and screw missing. ' ADJUSTABLE TRIGGER BAR STOP --Screw threads stripped; body cracked, broken; nut loose, miss- ing, threads stripped; spring weak, busted. TRIGGER BAR Binds, bent, crack- ed, busted, doesn't have notch in top; not installed; trigger bar pin assembly bent, missing, lock broken. SOLENOID TRIGGER BAR (On M45 Only)-- Bent, bur- red, busted. BOLT STOP- Bent, brok- en, missing. ..-s BARREL SUPPORT PIN--T Not seated, busted, cotter key missing.