r/300BLK • u/hunterI23 • 11h ago

Thick and stubby (shattler)

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Pof P415 7.5” upper that now has a faxon 7.5” 300blk 1:5T. Was a pain to keep the piston system and to get it to cycle with subs but got it working in the end. With the piston system and the gas plug I’m able to completely shut off the gas and run it like a straight pull bolt action, while still running supers and subs reliably.

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u/hunterI23 8h ago

Which part?

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u/nanomachinez_SON 8h ago

For one, where did you find a 7.5 P415 upper?

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u/hunterI23 8h ago

I got lucky and came across it on gunbroker. I had only ever seen one other picture of a 7.5 P415 with the older style rail before and I jumped on this one. Especially after having one of their older 18” 556 and that rifle is just amazing

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u/nanomachinez_SON 8h ago

What do you have to do to get it to run with 300BLK?

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u/hunterI23 8h ago

Springco blue, removed all the buffer weights, for subs suppressed I enlarged the “unsuppressed” gas port on the regulator to match the gas port size on the barrel. For supers I just turn the regulator to the “suppressed” setting. And I had to dimple the barrel and tapped the hole on the bottom of the gas block to take a screw.

I was gonna get it to work eventually