It works, but not the best option - UTG Pro Model 4/AR15 Receiver Wedge

This is a good deal at the price for sure, but I found the plastic it is made of was hard to cut straight, for me at least, I don't have a work bench or precision tool. It also makes it tough to impossible to put the rear pin in if you don't trim enough. I trimmed too much in the end, and there was still slop in the upper and lower. If you're going to get one, get 3...at $1.50 if you trim too much, try again. I ended up getting a Demon Tactical rear takedown pin, it expands and takes ALL the slop out...it was a lot more money compared to the buffer, but easy to install and I'm much happier with it
Pros: Cheap
Cons: Tough to trim if you don't have the right tools

This review was written in the old system and had content requirements that are different than reviews written today.