[Capt'n Mil Coll]

You can also get used and repo parts at Sportsmas Guide.
Discount Hunting Gear, Discount Hunting Boots, Discount Shoes, Discount Ammunition, Discount Ammo, Discount Boots, Military Surplus, Outdoor Gear At the Sportsman's Guide

Cheeper than dirt. Cheaper Than Dirt - America's Ultimate Shooting Sports Discounter

Springfield Sporters. MISCELLANEOUS PARTS AND ACCESSOR
There are plenty of others but I have used these.