The Firing Line Forums - View Single Post - Help--removal of HK USP firing pin

Davey in NM · March 17, 2000, 05:29 PM

About 4 years ago I put 12,000 rounds of Winchester USA 180gr .40S&W FMJ ammo through a full size HK40 USP. This ammo has a red colored lacquer around the primer.

After about 4,000 rounds I noticed some light firing pin hits. Careful examination showed a red color around the firing pin hole. I used one of the spray cleaners (QuickClean, I believe) which I sprayed in after first depressing the firing pin. An amazing amount of red gloop came out the firing pin hole. I repeated the process several times until no more red gloop came out. Then I dripped in some Birchwood-Casey's Sheath.

After every subsequent 2,000 rounds I repeated this procedure. There was no problem with the remaining 8,000 rounds.

So there is a reason to be concerned about crud in the firing pin channel. There was no need, however, to remove the firing pin to solve that concern.

March 17, 2000, 05:29 PM	#6
Davey in NM Junior Member Join Date: March 17, 2000 Posts: 6	About 4 years ago I put 12,000 rounds of Winchester USA 180gr .40S&W FMJ ammo through a full size HK40 USP. This ammo has a red colored lacquer around the primer. After about 4,000 rounds I noticed some light firing pin hits. Careful examination showed a red color around the firing pin hole. I used one of the spray cleaners (QuickClean, I believe) which I sprayed in after first depressing the firing pin. An amazing amount of red gloop came out the firing pin hole. I repeated the process several times until no more red gloop came out. Then I dripped in some Birchwood-Casey's Sheath. After every subsequent 2,000 rounds I repeated this procedure. There was no problem with the remaining 8,000 rounds. So there is a reason to be concerned about crud in the firing pin channel. There was no need, however, to remove the firing pin to solve that concern.