Overview Reviews Product Description F.A.B. Defense M4/M16 Shock Absorbing Buttstock With Cheek Rest, Fits AR Rifles, Black FX-GLSHOCKCP Product Videos Product Reviews Write a Review Write a Review × F.A.B. Defense FAB DEF M4 SHOCK ABSORBING STK W/CR Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *