Lead & Steel Llc LS300-10.5 300 Blackout 10.50" Government Profile Features M4 Feed Ramps
https://www.tandktactical.com/shop/7427053012461-lead-steel-llc-ls300-10-5-300-blackout-10-50-government-profile-features-m4-feed-ramps-57834
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The Lead & Steel AR-15 barrels are turned from 4150 Chrome Moly Vanadium Steel and coated in a QPQ Black Nitride finish.