Product Description
TheShorty Boy w/Fin Arm Brace 10.5-inch AR-15 5.56 NATO Pistol Full Build Kit from MCSis engineered for gunsmiths seeking precision and durability in a compact firearm. This kit features a 10.5-inch barrel made of 416R stainless steel with a 1:7 twist rate, optimized for .223 and 5.56 NATO cartridges. The polished stainless finish and M4 contour enhance both performance and aesthetics.
Included is a 10" M-Lok handguard that offers a lightweight design with integrated handstop and anti-rotation features. The kit also comprises a stripped upper receiver from 7075 T6 aluminum, alongside a complete bolt carrier group constructed from 9310 alloy steel. Accompanying the build is a polymer stabilizing brace from Gauntlet Arms, providing additional support. Weighing just 73.8 oz, the Shorty Boy is an ideal choice for shooters valuing both compactness and dependable performance.
Product Name:Shorty Boy w/Gauntlet Arms Brace 10.5-inch AR-15 5.56 NATO Pistol Full Build Kit
Caliber:5.56x45mm NATO
Barrel Name:AR-15 10.5" "Needle" 5.56 NATO, SS, Carbine Gas, M4 Contour, 1-7 T Barrel
Barrel Material:416R Stainless Steel
Barrel Length:10.5-inch
Barrel Twist Rate:1:7
Barrel Finish:Polished Stainless Steel
Barrel Thread Pitch:1/2×28
Barrel Gas System:Carbine
Barrel Profile:M4
Muzzle Device:AR-15 1/2×28 TPI GI Birdcage Flash Hider 5.56 .223 A2
Muzzle Device Thread Pitch:1/2×28
Muzzle Device Finish:Manganese Phosphate
Handguard Name:10" MLOK AR-15 Handguard W/ Picatinny Rail, Integrated Handstop, Anti-Rotation Tabs, Trapezoid Cuts
Handguard Style:M-Lok
Handguard Color:Black
Gas Block Name:Recoil Technologies Micro Low-Profile Gas Block for .750 O.D Barrel Steel
Gas Block Size:0.75
Gas Block Finish:Phosphate
Receiver Name:Stripped Upper Receiver with M4 Feed ramps – 7075 T6 Aluminum, Anodized
Upper Receiver Material:7075 T6 Aluminum
Upper Receiver Finish:Anodized
Bolt Carrier Name:AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group
Bolt Carrier Material:9310 Alloy Steel
Bolt Carrier Finish:Nitride
Charging Handle:AR-15 M4 Charging Handle Mil-Spec Quality
Charging Handle Finish:Anodized
Pistol Brace Information:Polymer Stabilizing Brace – Black from Gauntlet Arms
Brace Color:Black





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