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Upper Assembly kits

Combat Armory's upper assembly kits are complete, no-assembly-required AR-15 uppers, 8 configurations priced from $169.99 to $279.99 depending on caliber and included components. Options include a 16" 1:7 twist 5.56 upper with a 15" slim M-Lok handguard and a 7.5" pistol-length 5.56 or 300BLK upper with a 7" M-Lok or full picatinny handguard.

Each kit can be ordered as the bare upper or bundled with a bolt carrier group and charging handle, so you can drop the whole assembly onto a compatible lower without sourcing additional parts separately. Handguard styles include slim M-Lok and full picatinny M-Lok rail options depending on the listing.

Confirm the caliber, barrel length and whether you need the BCG-and-charging-handle version before ordering, since bare-upper and combo listings are priced and configured separately across the eight options currently available in this upper assembly kit collection right now, in stock.

8 products

Upper Assembly kits questions

Do these kits include a bolt carrier group?

Some listings include a BCG and charging handle, marked clearly in the product name for that configuration. Others are the bare upper assembly only, so check each listing carefully before ordering.

What calibers and lengths are available?

5.56 NATO uppers come in 7.5" and 16" lengths, and 300BLK uppers are offered in 7.5" and 16" as well, each built around a 1:7 twist barrel for their respective caliber.

Will this upper fit any AR-15 lower?

These are built to mil-spec dimensions and are intended to fit standard AR-15 lower receivers. Confirm your specific lower's specs match before ordering to avoid a fit issue.

How fast do upper assembly kits ship?

In-stock kits ship within 24 hours of purchase, with free shipping over $99 and 30-day returns available on unused, unassembled kits that have not been installed on a lower.