Product Description This Recoil Spring and Guide Rod Assembly is fitted for your M&PA(R)9 and M&PA(R)40 Compact. (Will not work in 2.0 Compacts). M&PA(R)9 and 40 Caliber Compact Recoil Guide Rod Assembly at Smith & Wesson Accessories $12.99 Buy Now Check Price on Amazon Check Price on eBay