Loneygoons got some suggested upgrades as for owners of the Tokyo Marui M4 MWS GBBR. The recommended parts are from G&P, Laylax, Maple Leaf, PDI, RA-Tech as well as BBs for more accuracy... "Hope this helps some people get the most out of and enjoy this awesome GBBR platform, whether you’re using it for training or airsofting, I highly recommend them."