Fits, but poor quality
Reviewer: MisterB
2/12/2009
I bought this item just because I couldn't find a receiver extension tube anywhere else. I'm very disappointed in it.
First, even thought the item description says "military" M4 stock, it isn't a milspec tube, it is a commercial sized one.
Second, the castle nut provided is so soft that the ears rounded off under very light torque. I'm a mechanic by profession, and this isn't my first build by any means. I know I didn't apply too much force, its just poor materials. The castle nut appears to be made from cheap aluminum instead of hardened steel.
Third, because the castle nut ears rounded off, the carbine wrench slipped and left tool marks on the buffer tube and my receiver (tiny, but there) I'm not too worried about this gun, cause its just gonna be a backup/truck gun, but if someone else is building something they want to stay nice, DON'T USE THE SUPPLIED CASTLE NUT!! Buy a good one.
And last, the collapsible stock doesn't click cleanly into each position. In a couple of positions, I have to jiggle the stock body to get the detent to drop into place.
Overall, I'm disappointed. I wasn't looking for a super high quality piece here, but I was looking for one that would assemble and function properly.