The compact 5.7×28 platform blends low recoil, high capacity design concepts with modern ergonomics to give defensive shooters and range enthusiasts a fast-handling, controllable semi-auto option. In tight environments or for disciplined target work, a purpose-built rifle like this can offer distinct advantages over traditional pistol calibers while remaining straightforward to operate and accessorize.

KELTEC R50

The KELTEC R50 adapts the FN P90/PS90 horizontal feeding concept into an AR-style platform. This California-compliant configuration ships with a fixed, non-folding stock and a 10-round magazine, making it legal in restricted jurisdictions while retaining the core handling traits of the 5.7 design.

Key features and tactical layout

The R50’s hardware list is focused and practical: a 16″ threaded barrel provides options for muzzle devices and suppressor-ready setups, while a QD sling cup makes single-point or quick-detach slings simple to mount. The top of the receiver offers about 7″ of Picatinny rail for optics and backup sights, and there’s roughly 2″ of rail space on the bottom to attach minimal front grips or light mounts without adding unnecessary bulk.

View product details and pricing — listed at $879.99 — and see how the R50 compares if you want a compact 5.7 solution that stays compliant in restrictive states.

Performance and applications

The 5.7×28 cartridge is known for low felt recoil, flat trajectory, and high magazine capacity potential. In the R50, that translates to fast follow-up shots, good controllability from the fixed stock, and efficient target transition at typical personal-defense and range distances. The horizontal-feed design keeps the grip geometry compact and familiar for many shooters, and the 16″ barrel maximizes the cartridge’s velocity potential compared with shorter-barrel pistol variants.

Why choose this model?

This KELTEC R50 model stands out for blending P90-inspired feeding with rifle-length sight and optic options, plus modern accessory points. The inclusion of the threaded 16″ barrel and QD sling cup makes it a practical choice for users who want a ready platform for lights, optics, and sling setups without heavy modification.

For a compact, CA-compliant 5.7 rifle with distinctive horizontal feeding, solid accessory space, and a practical parts set, the KELTEC R50 deserves a close look. Check current availability and specifications on our shop page to confirm fit and local compliance before purchasing.

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