Otter Creek Arms Llc OCL-301 SPR Collar Black Nitride
https://www.tandktactical.com/shop/664533658994-otter-creek-arms-llc-ocl-301-spr-collar-black-nitride-42458
https://www.tandktactical.com/web/image/product.template/42458/image_1920?unique=1d2e649
Short SPR locating collar for ops inc 12 model, AEM5 and OCM5. Made from H900 heat treated 17-4 steel with a black nitride finish.
