Check the listing for details. Marauder Air Pistol Rail Options Benjamin Crosman. Condition: New. Listed at 12.00 USD. These rails are 3D printed out of Polycarbonate The single rail for the foregrip includes a longer # 8 screw but with a 9/64 hex head. The wings help the rail not twist on the stock. The tri-rail for the foregrip also replaces the bolt with a longer 9/64 hex head bolt. The tri-rail for the air cylinder uses two M3 hex bots and recessed M3 nuts The tri-rail Fore-Grip includes 2 longer bolts with a 9/64 hex head bolts. This listing complies with eBay's air gun policy and I will only ship air gun accessories to buyers in jurisdictions where permitted to by applicable laws https://www.ebay.com/help/policies/prohibited-restricted-items/airsoft-air-rifle-bb-guns-policy?id=5045 This listing complies with eBay’s air gun accessories guidelines found here and I will only sell and ship air guns to buyers in jurisdictions where permitted by applicable laws http://pages.ebay.com/help/policies/firearms-weapons-knives.html