uM40A1 VC Piston setv
PRODUCT CODE:645579
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For Sunprojects M40A1(not gas)
This is made of Duralmin.So it would have durability.That has Vacuum system in the head, so BB go straight & far away !
And Spring guide has thrust ring to clear the spin occured twisted spring.
Please use large diameter spring like a APS series.

Sale \5,733
Sold OutI

Please read the below policy
We deem to get your agreement for the below policy when you place an order.
›We couldn't assure the trouble with your lack of skill.
›It may be required to adjust to fit because our custom parts reduce the clearance of normal parts to lead the best condition.
›Do not use the 3rd party products.Because we design with Normal parts or PDI-products.
@If you ignore our rule & breake up your gunsAwe couldnft be responsible.
›It is possible to change the spec or design.