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SI Defense Complete Forged A3 Upper Assembly
Our Price: $575.00

Complete upper assembly. 16” M4 chrome-moly barrel with iron front sight, forged A3 7075 upper receiver, plastic handguards, flash suppressor, Mil-spec bolt carrier group and aluminum charging handle. Assembly is headspaced and ready to attach to your lower. Chambered to .223 Wylde. Weighs 4 lbs. 1.4 oz.
SI Defense Classic Complete Billet A3 Upper Assembly
SI Defense Classic Complete Billet A3 Upper Assembly
Our Price: $775.00

Complete upper assembly. 16” HBAR chrome-moly barrel, Generation II A3 7075 upper receiver that features a removable picatinny rail, installed dust cover, carbine-length customizable free float tube handguard that includes top and side rail, SI Defense DRK compensator, Mil-spec bolt carrier group and aluminum charging handle. Assembly is headspaced and ready to attach to your lower. Chambered to .223 Wylde. Weighs 4 lbs. 5 oz.

OPTIONS

• 416 stainless steel barrel
• M4 barrel contour
• FailZero® bolt carrier group and charging handle
• YHM Phantom flash suppressor
• Smith Vortex flash suppressor
SI Defense Classic Complete Billet A3 Upper Assembly
SI Defense Classic Complete Billet A3 Upper Assembly
Our Price: $825.00

Complete upper assembly. 20” HBAR chrome-moly barrel, Generation II A3 7075 upper receiver that features a removable picatinny rail, installed dust cover, rifle-length customizable free float tube handguard that includes top and side rail, SI Defense DRK compensator, Mil-spec bolt carrier group and aluminum charging handle. Assembly is headspaced and ready to attach to your lower. Chambered to .223 Wylde. Weighs 4 lbs. 5 oz.

OPTIONS

• 416 stainless steel barrel
• M4 barrel contour
• FailZero® bolt carrier group and charging handle
• YHM Phantom flash suppressor
• Smith Vortex flash suppressor

Options may cause an increase in delivery times. Please email for accurate shipping date.
SI Defense Classic Complete Billet A3 Upper Assembly
SI Defense-PWS Complete Billet A3 Upper Piston Assembly
Our Price: $1,399.00

Complete piston system upper assembly.

Primary Weapons Systems Diablo piston system with the SI Defense Generation II billet upper. The ultimate in reliability. Drop on your lower and go.

16” HBAR chrome-moly barrel, Generation II A3 billet 7075 upper receiver that features a removable picatinny rail, installed dust cover, carbine-length quad rail handguard with Tango Down® rail covers, PWS FSC556 flash hider/compensator, Mil-spec bolt carrier group and aluminum charging handle. Assembly is headspaced and ready to attach to your lower. Chambered to .223 Wylde. Weighs 5 lbs. 2 oz.

OPTIONS

• 416 stainless steel barrel
• Graphite black Cerakote barrel coating
• M4 barrel contour
• FailZero® bolt carrier group and charging handle
• SI Defense DRK compensator
• PWS CQB compensator