Kel-Tec FRB Carbine and FRB Sniper Rifle

RFB stands for Rifle Forward ejection Bullpup. This concept, enhanced by an improved tilting block breech,
gains over a foot of additional barrel length over a conventional rifle. Furthermore, the stock and mechanism cross-section is similar to a conventional rifle, in stark contrast to the bulky bullpup rifles existing today. The RFB is a gas-operated semi-automatic rifle in 7.62 mm NATO (.308 Win) caliber. It accepts standard FAL type magazines. Barrel options include 18", 24", and 32". Twist 10" or 11.25".

Kel-Tec FRB Carbine Rifle

Kel-Tec FRB Bullpup Rifle

All controls are fully ambidextrous; the reciprocating operating handle can be switched to either side. The
trigger mechanism has up to five individual adjustment parameters. The dual action safety disconnects
the trigger and blocks the hammer action. A MilSpec picatinny rail is attached rigidly to the barrel. No iron sights are provided. A free floating, four sided picatinny forend or bipod can be attached directly to the barrel.

Kel-Tec FRB Bullpup Sniper Rifle

Kel-Tec FRB Sniper Rifle

The improved ballistic efficiency of the RFB rifle derives from a very long barrel increasing muzzle velocity over 10% when compared to similar size rifles. The long range improvement is even more pronounced
with a heavier bullet at normal velocity. An M110 SASS shoots a 175 gr projectile at 2500 fps.The RFB will fire a 210 gr bullet at the same velocity, resulting in 65% more knockdown energy at 1000 m. At the same
distance the wind deflection is reduced to 72%. This ballistic performance is superior to a traditional 300
Win Magnum and closely approaches a 338 Lapua.

Kel-Tec FRB Bullpup Rifle ad Kel-Tec FRB Bullpup Sniper Rifle

The Kel-Tec RFB has several new and innovative features which are here divided as sub-functions: Ballistic, feeding, ejection, firing mechanism, and ergonomics. The RFB barrel acts as a spine in the rifle. The compact
receiver and tilting bolt close the breech. The sighting system is solidly attached directly to the barrel. Forward of the sights the barrel is free floating. Close to the chamber the gas pressure determines the dimensions of the barrel. Further forward, rigidity and mass are more pronounced for the sake of accuracy.

The hollow, trapezoidal, sheet metal bolt carrier is propelled by a captive, adjustable gas piston. The return force is from two small diameter coil springs with a high pre-load. The mass ratio of bolt to bolt carrier is a favorable 1 : 4. The RFB utilizes a proven FAL metric type magazine. Two symmetrical extractors are mounted on the sides of the bolt. The extractors can rotate around a pivot point in the back and can also move sideways to engage the rim in the case. The extracted case is rotated upwards and on the way forward fed into an ejection chute above the barrel. The chute extends and turns right to a forward opening where the
case is gently ejected.