Bastion rear slide cover plate for Smith & Wesson S&W M&P 9mm .40 40 cal .357 45 acp full size & compact only, butt plate laser engraved - Bastion Skull Compatible with S&W M&P 9mm, .40, .357, .45ACP Full size and Compact ONLY Including New Model 2.0 Is NOT compatible with SW MP Shield model Hard coat anodized red T6 machined aluminum Lasered artwork won't rub off; not painted Replaces factory plastic part