Jaeger Precision performs a maintenance upgrade on a GM SCAR-L MWS GBBR to prepare for an event. The upgrades are intended to reduce the "spring twang" noise and make the rifle perform similarly to the presenter's other MWS rifles. The presenter disassembles the rifle, upgrades the barrel and hop-up unit with a new stainless steel barrel and a modified Titan nub, and performs maintenance on the bolt carrier group by lubricating the nozzle spring to eliminate the spring noise. After reassembling the rifle, the presenter tests the upgrades and confirms that the spring twang is gone.