Airsoft Canada - View Single Post - Tanio Koba / KJW M4 GBBR Basic Information and FAQ

Art Vandelay · May 10th, 2013, 10:54

I'd like to do the mod where you drill a hole into the top of the receiver and put a grub screw in to control the hop up.

Are there exact measurements on where to drill, or am I just supposed to do it in the exact centre of the front? It looks like the hole is drilled into the exact centre.

May 10th, 2013, 10:54	#887
Art Vandelay Trader rating Join Date: May 2013 Location: toronto	I'd like to do the mod where you drill a hole into the top of the receiver and put a grub screw in to control the hop up. Are there exact measurements on where to drill, or am I just supposed to do it in the exact centre of the front? It looks like the hole is drilled into the exact centre.