A3 Industries 1913 Folding Polymer Stocks w/Riser Black 9.50in. Available in multiple lengths with various add-ons they can be easily configured for a host of unique applications and fit on any firearm with a rear 1913 Picatinny mounting point. The stock itself is injection molded from fiber-reinforced polymer producing a very rigid design with no flex. They are available in 8.50" and 9.50" base lengths and these lengths can be custom tailored with the optional length modifiers shown in the images above. An optional cheek riser and QD (quick-disconnect) sling moutning socket is also available. These hybrid stocks utilize our popular steel APEX hinge assembly composed of 17-4 stainless with a durable Nitride coating. The hinge features a positive lock in the deployed position and a quick-deployment feature from the folded position. Specifications for A3 Industries 1913 Folding Polymer Stocks w/Riser: Manufacturer: A3 Industries Color: Black Weight: 14 oz 17 oz Features of A3 Industries 1913 Folding Polymer Stocks w/Riser HD steel hinge glass-reinforced injection mlded stock polymer cheek rest Package Contents: A3 Industries 1913 Folding Polymer Stocks w/Riser CHEEK RISER A3 Industries PFS-9.5-R: 1913 Folding Polymer Stocks w/Riser Black 9.50in