King Arms High Power Bolt Carrier Set for WA / G&P / King Arms M4 Airsoft GBB Gas Blowback Rifles

"Solid bcg. great kick and weight. Love it. Even tho its zinc alloy, it feels very sturdy. hopefully it lasts a while.

"Perfect fit in my S&T M4 GBBR.

"This bolt assembly is High Power I got it in my Matrix/S&T M4 and shoots 445-460 FPS with a Hive extension Barrel, which makes it a DMR/Sniper Rifle now only.

"This is a replacement for wa king arms well g&p type m4. Pre assembled and ready to drop in. I'm not sure if it increases fps, seems to be a direct replacement.