Otter Creek Arms Llc OCL-202 M4 Collar Raw Heat Treat
http://www.tandktactical.com/shop/664533659045-otter-creek-arms-llc-ocl-202-m4-collar-raw-heat-treat-42463
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Locating collar for M4 spec barrels and ops inc 12th model, AEM5 and OCM5. Made from H900 heat treated 17-4 steel.
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