New HK SP5K

[Pappabear]

I've got close to 8k rounds through my MKE made MP5 and it even runs Tula steel and Blazer aluminum without issue. Zenith recommends 200 rounds of 124gr to break in, and that seems to work for most people. Initially I had some issues running JHP but after shooting a bit more ball tried again and found it would run 115, 124, and 147 JHP's (Gold Dots, HST's, Ranger T, you name it). Being a K, it might be more ammo sensitive though.

I agree the K guns might be more sensitive. Mine is the longer barrel and I run a can and it runs everything.

PB

[RetroRevolver77]

Delete.