The slide and barrel of the PMR30 are 4140 steel, and the frame is 7075 aluminum. Much like other Kel-Tec Pistols, the grip, slide cover, trigger, mag release, and safety levers are glass reinforced Nylon (Zytel). The magazine is Also Zytel, and holds 30 rounds, with round count ports.
Other features include: dual opposing extractors for reliability, heel magazine release to aid in magazine retention, dovetailed aluminum front sight, Picatinny accessory rail under the barrel, Urethane recoil buffer, captive coaxial recoil springs. PMR30 disassembles for cleaning by removal of a single pin.
Bought the PMR new in Dec 2016. Twice at the range: multiple jams, failure to feed, impossible to use the 30 round magazine. Very frustrating firearm, sold it in Feb 2017. Bought a FN 5.7x28mm. It rocks. Pure perfection..
If you have priced a 57 you know that they are over $1k. If you have held on in your hand you know they are a BIG gun. They aren't really a carry type gun, so like the PMR 30, it is typically a back up or just a range plinker. Ballistically, for the money I would go for the PMR 30. Gel tests conducted by many experts concluded although the PMR 30 is not quite as powerful as the 57, it is so close that I would not waste the extra cash for the FN. It of course depends on what rounds you are shooting but comparatively save your money buy a PMR 30.
I got this several months ago and cleaned it first, as you should before shooting. I used the suggested ammo and have not had a problem w/the pistol. I load 30 rounds in each mag and have taken it out now three times without one single misfire of any kind. I have ran clips as fast as I can shoot and shot slower to change firing to try and see if it would fail. I do not use this for self defense due to 22 MAG but it is usually with me in a bag on the motorcycle as a good back up pistol. You cannot beat a pistol with 30 rounds and a back up clip with 30 more!!!
Save your money up and buy superior quality in FN FiveseveN