(A)rm(B)ar(9)inch(R)ise + AB-FB Folding Buttplate + JMac 1913 Folding Mech (not assembled) Lightweight and Rigid! Modular Design - Brace/Stock with many mounting options Integrated QD Sling Socket 9" Length 7075 T6 Aluminum Hard-Coat Tanodized This buttplate mounts to the end of our AB (Arm Bars) Folds to prevent snagging while pulling from a bag Folds clear of drum mags 7075 T6 Aluminum Hard-coat Anodize Includes Mounting Hardware (Pin and Clip) JMac 1913 folding mechanism. Mfg: Jmac Customs