I am having feeding/cyling problems with a 9mm I built, I used a 9mm hammer and a ramped bolt carrier, was told this may cause issues.

Can anyone confirm this?


Thank you

It WILL cause problems.  The 9mm hammer was designed to run with a non-ramped bolt, but it doesn't alleviate the problem of how harsh the bolt can be on the hammer and hammer pin.  A ramped bolt with a standard, NON-NOTCHED hammer will act the same way as a regular AR carrier on a regular hammer.  Remember that the Colt-style 9mm carbine is based on their SMG, which is basically an M16 lower with a pinned-in magazine block and a 9mm upper.  The closer to an M16 hammer you get, the better.  A rounded,  "DPMS-style" hammer is essentially an M16 hammer without the bit that an auto sear catches.

Thank you,

Appreciate the information