A full cylinder will maximize you're air-flow. combined with a 400mm barrel it's deadly.
I run an m110 with a full cylinder seal and my tavor is pushing 405-410. On the other note it shoots with a very crisp and similar response to a PTW.
However i built mine for front line duty primarily for assault roles
if you're going DMR you will want a full cylinder.
Regarding the cylinder head and piston i'd recommend you open it to check to be safe if so. Mind you the S&T is a clone, the only difference i've heard of was regarding the barrel and hop-up witch are not attached to the gearbox internally.
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Legion XIII
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