Inokatsu is releasing conversion kits for the Western Arms CQB-R, which are namely; M4-CQBR and the M4SOP. Prices for both are at US$709 and plus the WA M4 CQB-R with blowback, and its magazines, will really set you back over a thousand bucks just to real­ly give that cool look. But as long as you've got the money to burn, you can't complain. You can go and visit the Inokatsu website as you can also download instruction manuals on how to install these kits. ­Mainly made of steel and aluminium.