I ended up going back to the carbine stock. I really like this prism sight, but eye relief was a little too long on the rifle stock, and only got worse with heavier clothing.

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I followed this excellent advice,

Originally Posted by Formidilosus
The PSA FN barrels are gassed to run worst case- weak 223 with an H2 buffer.

You'll want an H2 (H3 might be worth a try), and ensure you have the SOCOM bolt upgrade kit for the extractor to use 5.56mm pressure Ammo.


New extractor including new spring/plunger/o-ring, and an H3 buffer. Runs great now with an authoritative 'thu-thunk' as that H3 buffer drives the bolt home. Brass shows barely visible extractor claw marking.

I'm done.