GXN prefix, approx 4K rounds through it. Factory stock except for night sights.
Here is the current problem:
I am getting BTF (Brass to Face) when using duty/SD type ammunition. There are no BTF issues when I use my standard range ammo.
BTF Ammunition: Speer GDHP 124 grain +P and standard pressure. Hornady Critical Duty 135 grain +P and standard pressure. Federal HST 124 and 147 standard pressure.
No BTF: Federal American Eagle 115, 124 and 147 grain. Federal RTP 115 grain standard pressure.
The BTF issue just started within the last few range trips. The recoil spring has maybe 2k on it, extractor is solid with no chips, ejector is good, depressor plunger is the correct setup without issues.
This gun has never exhibited BTF prior to this with any ammunition used.
Any thoughts?
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