>>4
https://defensereview.com/hydraulic-recoil-buffers-for-the-tactical-ar-15m4m4a1-carbinesbr-friend-of-foe-from-the-enidine-recoil-buffer-to-the-kynshot-recoil-damper-and-crosshair-buffers/
コルトじゃなければもちろんあるよ