You are in a combat situation. You dive into a ditch and land on your rifle. You bend your receiver extension tube slightly (as little as 2 degrees). You return fire... first round, rifle malfunctions and your bolt carrier is stuck in your receiver extension tube. Worse, the stuck bolt carrier will not allow you to field strip your rifle and clear the malfunction. Don't let this happen to you! Buy an ACE M4-7 or a M4-7 RET. M4-7 and M4-7 RET. Patent pending.

1. Gusset reinforced receiver extension tube (RET) is many times stronger than the current issue mil. spec. RET. A tapered RET and gusset reinforce the receiver, and when the gusset screw is tightened the gusset is pulled tight into the receiver.
2. Laser etched delineations, ensure a visual confirmation of your stock's position.
3. Seven position for the perfect fit. RET extends out to 11.0" long in seven 5/8" increments. Fully collapsed it is the same length as any other M4 six position stock- 7.3".
4. Adjustable screw in stainless steel stops, allow repeat adjustment to the same position every time in any conditions.
5. Adjustable shim screw-in RET allow slop and rattle to be adjusted out of the stock.
6. Four sling positions. "Ambi" single point, top and bottom.
7. Includes SS-AR, rubber coated, 360 degree, 1 1/4" sling swivel.