The muzzle of the Kel-Tec P17’s 3.8" barrel is threaded, and the gun comes with both a 1/2x28 TPI threaded barrel extension and a thread protector (shown).

Built in optics compatibility, a threaded barrel, and three sixteen-round magazines come standard with each P17. It also features some novel ergonomic changes for Kel-Tec, diverging from the ...