The BOYI/Dboys M4 CASV has long upper rail, side rails and bottom rail that can accept both airsoft and real accessories. Rails are metal made while the system frame is plastic. The method how the S-System is locked to the gun is simple and well functional. Given the functionality of S-System battery exchange is relatively easy. Unlike in the M4 RIS this time the battery can be stored inside S-System and special wiring is provided with the gun to faciliate this.
As in real SIR-system the S-System has holes across its body to allow re-positioning of rail units. Both flip up sights are fully adjustable and the rear sight is secured to low profile position with help of side lever. Similarly front flip up sight has release button to allow positioning to low profile position- 320 – 350 fps (0.2 g BB)- Integrated RIS System with Top Rail and Foregrip- 300 Round Hi Cap Magazine- Adjustable Front & Rear Site- Adjustable Hop Up- Full Metal Body & Metal Gear Box- Made in China
Filed under: Dboys/Boyi, Guns & Equipment | Tagged: AEG, airsoft, Boyi, CASV, DBoys, Gun, M4, Rifle |
FRAG International 
I’m getting this gun asnd I hope its good. It goes like 260 fps.
how is this compared to a jg s-system? (internally and overall)
Honestly speaking, I haven’t seen the new 2008 DBOYS CASV yet. We’ll make a comparison as soon as we get hold of one.
Is the performance of this gun good?
I have been doin research on this gun and do u know y it is cheaper than other m4 s-systems?
Will this gun be good for experienced players?
It is cheaper for it is manufactured in china. We tested this unit before and we’d recommend buyers to shift to other models or brands. For experienced players, we’d recommend to buy the “high-end” versions aegs, such as Classic Army, Tokyo Marui, ICS, VFC or G&G
Will this take normal mags? Yes
will i have to mod the mags? Nope