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Upper Parts Kits

Shop AR-15 and AR-10 upper parts kits with the components needed to assemble or repair your upper receiver. Featuring quality parts from trusted brands for a dependable build.
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[KIT-MCX-PISTON-16B-556] Sig Sauer MCX Piston Assembly for 16" BBL 5.56mm NATO KIT-MCX-PISTON-16B-556-01.webp

Sig Sauer MCX Piston Assembly for 16" BBL 5.56mm NATO

$ 252.99 252.99 USD
[KIT-TRD-BBL-NUT] Sig Sauer M400 TREAD (AR15) Barrel Nut KIT-TRD-BBL-NUT-01.webp

Sig Sauer M400 TREAD (AR15) Barrel Nut

$ 28.99 28.99 USD

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