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The company debuted the P50 pistol in 2021, which uses flat 5.7mm FN P90 pattern magazines in a top-loading format via a hinged receiver. Offered first in a pistol, then in a P50 carbine kit with a 16-inch barrel and a foldable stock, it performed well in our tests.

Updating the concept, KelTec has flipped the loading to a faster and drop-free format and ditched the pistol-style trigger on the P50 for a more AR-ish SU16 trigger group on the new KP50. Other features on the gun include a B5 Systems AR-pattern grip, a rear accessory mount, a top Pic rail, a rear non-reciprocating charging handle, and an optional “jungle mag” setup with dual 50-round magazines, allowing rapid switch-out following a drop and 180-degree rotation.

KelTec will be offering the KP50 in four flavors: an $899 MSRP’d pistol, a $1,099 pistol with a side-folding pistol stabilizing brace, a $1,349 Defender braced pistol with a Vortex Crossfire green dot optic and Magpul MBUS backup sights, and a $1,099 factory SBR that transfers on a $0 ATF Form 4.

There is also the price-available MP50, a select-fire variant (come on Hughes Amendment repeal) with a cyclic rate of fire of 850 rounds per minute until the mag holds out.

The concept of the KP50/MP50 isn’t entirely new. The autists at Pennsylvania-based Stuff and Things have been marketing its $239 bottom-feeding ST50 FCG kit for the P50 for about a year, which uses AR trigger groups and allows users to swap P-90 pattern 5.7 mags via an AK/EVO 3-style mag release.

The ST50 FCG kit

Still, kudos to KelTec for keeping folks guessing. The MP50, in particular, sounds invigorating.