A drop-in modification kit, the Wilson Combat® 1911 Compact.45 ACP 7-Round Spring & Follower Kit is made to provide dependable, smooth feeding performance with stock 1911 magazines. This kit comes with a heat-treated polymer follower and an easy-to-install high-tensile steel spring for immediate, jam-free operation. Compatible with tiny 1911 magazines #47 OX, OX-G, OXC, and OXCB (not included). American made.