This is the latest in the LWRC M6IC-SPR AR15 Line of Gas-Piston Carbine uppers that feature Helical Spiral Fluted barrel, 12" IC modular rail and permanently attached LWRC 4 Prong flash hider for a total barrel length of 16.1", which is the shortest you can have without federal registration.
This M6IC-SPR complete upper receiver is presented in Patriot Brown Cerakote Finish.
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All prices are in USD.