We are working very hard at replenishing all our inventory. In the meantime some items are taking longer than normal. Thank you for your understanding!
Available on backorder
Windham Weaponry’s powerful .450 Thumper is available as a complete upper receiver assembly – ready to snap onto your AR15 lower receiver/stock assembly. The assembly includes a 16” .450 Bushmaster caliber barrel with a two-piece M4 handguard, a .450 bolt & bolt carrier, and a straight, 5-round .450 magazine. The barrel is heavy profile 4150 chrome moly vanadium 11595E steel. It is chrome-lined in bore and chamber and rifled 1 turn in 24” – right hand twist – with 6 lands & grooves. The muzzle is fitted with an A2 birdcage-type flash hider. The complete upper receiver is laser engraved .450 Thumper for safety – do not mix ammunition when changing AR rifle calibers!
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