Close with polymer
$40.00
Labor to completely close with polymer the Release Lever Catch front section in the UMP lower, pin is modified to prevent slide out and top of the fill is milled out ( this service prevent the lower to be used in full auto function by replacing the disconnector, most call it wrongly as Auto Sear). This also helps to secure and create a strong base for the front slim plastic wall that hold the strong hammer springs.
-NOTICE- OLD STYLE UMP lowers require some extra milling and fitting, add $20 for those old lowers.