Tuning 90* fill nipple, break?

I really want to get my .257 Scandalous up to smashing condition before I buy anything else including a .338 Scandalous. Well I am going to need a decent compressor because it keeps me fit but airhog is putting it lightly. 7-10 shots from 3600 down to 1600 depending on what you count useable before it’s gone to dump the rest.
Unbelievable on precision out to the reasonable distances I have tested 400 with 2” groups quite easy.
It will hold sub 1/4” at 100 all day if regulated and tethered. Potentially 1/8 ragged sub dime 5’s
I know it’s not a FX or something fancy. It’s more like the rail gun of .257. Heavy.
I think harmonic balancer from Tim Swan & a few touches could get me competing.
Who would you have work on it or better yet what would you do with it.
A longer 32” 1:14 Lilja would help me clear the fill nipple

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