The legendary KWA 3GX mechbox is heavily reinforced and radiused to provide years of reliable use. The introduction of the 3GX mechbox brought AEGs to a whole new level of performance by introducing KWA's Kinetic Feedback System, or KFS, which provides a realistic felt recoil. The KWA RM4 ERG continues to build on KWA’s reputation of outstanding craftsmanship and dependability. These mechbox shells work with the original PTS RM4 as well as the new RM4A1 and RM4 KR Series!
You can select either the right, left, or both sides of the mechbox (by adding one at a time) in the dropdown menu. Please note that these mechbox pieces do not come with the 9mm bearings, which can be purchased separately in our ProShop.