ARS hop-up rubber, Shredder's Concave Spacer
Mill the top part of the barrel down so you're able to fit an 11.1 stick LIPO in there,
wire in a trigger master, polish the gearbox, check AOE, break in the gears and shimming.
Other than that... these things are nearly perfect.
170 spring is overkill. At most I'd go with a M135. Field limit for sniper rifles in ontario require certification... I'm not sure about their semi auto sniper rules either.
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