Thanks for all the input. All parts are present in the gun and everything seems to be working as it should since filing down the firing pin. Going to the range today to verify that it really is working properly.
When ordering a replacement firing pin, should I get it from Colt or are there better sources? It's not difficult to replace the firing pin but I'd prefer not to have to spend the money every couple thousand rounds.
Glock 20, Colt Delta Elite, Sig 1911 Extreme, Norinco SKS-D, AK47, Marlin 795 .22LR, CZ 452 LH .22LR, Colt M4 .22LR, S&W M&P-15 Sport, Remington 700 SPS LH 300 Win Mag, Winchester 1300 Defender 12ga, Winchester 1300 Black Shadow 20ga