Receiver slop between the upper and lower receivers compromises structural rigidity, creates distracting rattle during movement, and introduces subtle alignment variance between the bolt carrier, hop-up chamber, and loading nozzle on gas blowback platforms. The C&C Tac M4 Upper Receiver U-Shim Set provides a non-destructive, drop-in solution to tighten receiver lockup without resorting to permanent drilling or messy bedding compounds.
Stamped from high-tensile stainless steel to withstand repeated cyclic recoil, these shims feature a U-cut profile that slips directly over the receiver lug without obstructing or binding the takedown pin channel. The set includes a 5-piece assortment across 0.1mm, 0.2mm, and 0.3mm thickness increments, allowing operators to micro-space the interface to exact tolerances. Compatible across Tokyo Marui MWS (ZET System), GHK, VFC, WA, and WE-Tech AR-15 platforms, as well as standard-spec AR AEGs, this set eliminates receiver play to ensure a rock-solid, rattle-free build.
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