The FPC has a short throat (leade). If a cartridge is loaded with a bullet whose ogive is jammed into the rifling when the bolt is fully closed, extracting the loaded cartridge is quite difficult. There are three solutions . . .
First, test the ammo. With the FPS unfolded, drop a cartridge into the chamber and with your thumb check to see if it's seated to full depth. Now, see if you can rotate the seated cartridge freely. Then, hold the folded FPC with the muzzle pointing straight up to see if the cartridge will drop out on its own. If either or both of these tests fail, that particular loading is too long for the FPC chamber. (This is known as the "plunk test" -- the cartridge should make a "plunk" sound when it's dropped into the chamber.)
Solution one: If you shoot only factory ammo, test different brands till you find a load that passes the "plunk test."
Solution two: If you're a handloader, seat the bullet progressively deeper or select a different bullet profile until it passes the "plunk test."
Solution three: Use a chamber reamer to shave away the rifling to increase the throat .02" - .03", or whatever is necessary. The reamer made specifically for this operation is available from
Manson Precision Reamers. I have used this tool to correct the short throat in my FPS as well as three CZ 75 pistols and a Hi-Point carbine, all of which suffered from the same problem.
35 (9MM) Pistol Throater | Manson Precision Reamers
It's worth noting that this situation can also contribute to unexplainable "light strikes." This happens when the bolt is almost but not quite fully closed when the bullet contacts the rifling, but the trigger can still release the hammer. In this position the hammer cannot deliver a full blow to the firing pin.
Additional Note: Hickok45 ran into both the light strike, then the difficulty to extract the loaded cartridge in his evaluation of the FPS. He acknowledged something was going on with the gun, but he assumed an oversized chamber. He didn't think about a short throat. Start watching at about 21:00 on the linked YouTube video.
[ame]https://www.youtube.com/watch?v=WAT-EG9hFl8&t=1752s[/ame]
