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The Mat9 Upper is a self-contained complete 9mm receiver. Bufferless, compact and reliable. The blowback system runs suppressed or unsuppressed without spring changes. The charging handle is non-reciprocating and reversable for right or left-handed shooters. It is compatible with AR9’s and AR15’s with Mag Adapters. Compatible with Glock, Sig, Colt, Scorpion and Mp5 magazines. Veteran Owned made in San Antonio! Bufferless, self contained system AR lower compatible Blowback Design Non-reciprocating steel charging handle 4140 Nitrided steel bolt and action parts 6061-T6 anodized upper receiver 4150 Lightweight Nitrided Barrel, 7.825” long, 1:10 twist, 1/2x28 threads Tapered Multi Material 4 piece trunnion system to maintain mechanical accuracy and longevity NATO 1913 Spec top rail Over-Buffer-Tower design to maximize rail space 3 MLOK slots (both sides, bottom) Slim profile Recoil buffer Maintains bolt catch functionality Compatible with LRBHO lowers Glock®9mm, Sig 320, Colt 9mm mag compatibility (EVO and MP5 being tested) EZTS – Toolless takedown system Over the magwell balanced on complete lower Side folder compatible Machined for maximum weight reduction, profile, compatibility with bolt catches and lowers