Mega arms side charger. For sale is a Mega Arms side charging stripped upper receiver. If you're talking about a standard AR charging handle, it's up to you if you want to have one in addition. Build your AR today! See full list on bisonarmory. Shop ZEV’s MEGA Arms parts, including American-made forged uppers, lowers, and receiver sets. com You must use the G4 Enhanced Cam Pin in the G4 Side Charging Uppers! Use of the Standard Cam Pin will cause the Bolt Carrier Group to lock up in the G4 Upper Receiver and be VERY difficult to remove and possibly damage the Upper Receiver. Has an octagonal shaped profile. It can't hurt to have, but some side charging receivers won't have room for one. Mil-Spec with true black anodize finish. Oversized ejection port for large calibers. Sep 20, 2010 ยท I am currently putting together a precision build with a Mega Heavy Duty Billet upper receiver with side charger slot. M4 feed ramps. I got mine with no M-4 ramps as it is for a rifle. uorilj whwtsq numa nexzf ydi dztzi krmgdu gzl bmk eekqbhl