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KM4 CQB - M120 spring @ 310fps.. Upgrading Cylinder, Barrel?

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#1 rawfuls



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Posted 03 August 2014 - 02:28 PM

Hey all.

I had a topic here before, roughly a year ago- hopefully thats dead by now.

Anyways, I had a prometheus tightbore with a M120 spring shooting under 300fps.
Took it to a local shop as I had rammed my head into the wall roughly 300 times prior. They determined it was the cylinder head, replaced it with an aluminum piece and it seems to have worked.

However, now we're at a different issue.
Got it chrono'd at about 310 today.
M120 spring otherwise stock gearbox, stock barrel.

I'm looking to get around 400 fps. But NOT over.
So roughly 390.

Guys at the shop recommended a 363mm tightbore with a Type 0 cylinder.
What do you all think the route of upgrades should be?

If I can pull off 390 with the stock barrel and new cylinder, I'd much rather try that.

Edited by rawfuls, 03 August 2014 - 02:30 PM.

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