I went for the WiiTech http://www.wiitech.com.hk/product-detail.shtml?product_id=686&path=57_145
Similar, more concave shape to the nub. Works well with the tan bucking.
Anyone know where one could buy a stock marui cqbr outer barrel? Or any aftermarket 10.3 inch outer barrel that would fit with the stock barrel nut and front sight post?
Looks like G&P is releasing a drop in bolt carrier set for the MWS, and it comes with the roller attachement for either the stock or G&P buffer tube:
https://www.wgcshop.com/collections/new-arrivals/products/g-p-forged-aluminum-complete-bolt-carrier-group-set-for-marui-mws-m4-gbbr
https://www.wgcshop.com/collections/new-arrivals/products/g-p-mws-forged-aluminum-complete-bolt-carrier-group-set-for-g-p-buffer-tube
Also, someone testing a G&P 40 round magazine for the MWS