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Like new, I mounted Sig Echo Thermal* and zeroed in with about 15 rounds. Never seen more than the first trip to the gun range. The MK1 MOD 1-M line features the PWS long stroke piston system. Internally, this line offers the tried and true system that PWS owners have grown to know and love. Featuring a free-float MLOK handguard, forward assist controls, and a more true to mil-spec design, the MK1 MOD 1-M line is a go-to for not only civilians, but also Law Enforcement. With the fully forged upper and lower receivers, the MK1 MOD 1-M is a no-nonsense tool for when you need a high value option that is relentless and unstoppable. 1:8 twist threaded 5/8X24 1250.00+Free Shipping ***Sig Echo Thermal not included Thanks for looking