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- Tue Nov 13, 2012 10:09 am
- Forum: Primary Weapon Systems
- Topic: 300BLK piston guns from PWS
- Replies: 13
- Views: 13860
Re: 300BLK piston guns from PWS
USBP379 is correct. The outside threads on the 51T indeed fall under the extended lip on the MK109. Sounds goofy but a simple popsicle stick or small screwdriver works best to depress the lever and get one full rotation which is enough to clear the lip.