The TopStop cover is designed to snap on most AR15 or M4 type upper receivers when they are detached from the lower receiver. The TopStop completely seals the upper receiver preventing fouling from getting in or out and it stops the bolt carrier group and charging handle from sliding out as the upper is moved around. The TopStop is made out of super tough polymer and is impervious to most solvents and chemicals. This product is perfect for storing or transporting your spare upper recievers, especially in low-profile bags where the rifle must be broken down to fit.
Posted by Brad VanDonsel on 28th Jan 2017
This product is perfect for people that have extra Ar uppers.
Also perfect for breaking down to put in a smaller Ar case for
travel. Holds your Blot carrier and charging handle in place
Posted by condor on 15th Jan 2017
If your building or storeing complete uppers it's a must have item.
Posted by Daniel on 13th Jan 2017
The TopStop is great! I choose to have a small rifle bag so I disassemble my rifles. The receiver cover holds the bolt securely in and prevents my bag from getting all greasy or dirty. The fitment is snug and tight since it's new, but I'm sure will loosen up with time. Built with RCS quality!!
Posted by Kanan on 24th Nov 2016
Bought this as a fix to an issue I was having ! I run PWS piston uppers and had problems keeping the BCG contained in the upper, spring loaded BCG tend to run out of the upper when not connected to a lower, I bring more than 1 upper to the range. When transporting in a range bag my BCG would pop out and being greasy, would leave crud on my gear. This item completely keeps my upper secure and intact , BCG is kept where it's suppose to be. Plus, no more grease n crud anywhere. Didn't think I needed this , but now I can't think of a better way to transport my uppers.
Posted by Rudy on 17th Nov 2016
This is an absolute for any kit. Finally just what a shooter needs.
Posted by sean boyles on 27th Oct 2016
This thing is awesome. It keeps my spare uppers complete without have the BCG fall out. These are so good they should come standard from all the makers that sell complete uppers.
Posted by Timothy Frazier on 13th Oct 2016
THESE FIT NICELY AND DO THE JOB THEY NEED TO DO.
Posted by jason on 20th Sep 2016
This is an ingenious product. When the upper is off to place rifle in short storage like a BOB you don't need to worry about that BCG falling out. It comes off quick when you are ready and not before. Very cost effective as well..
Posted by Brian on 1st Sep 2016
Fit is very tight as should be when new. Does exactly what it is meant to do.
Posted by Unknown on 29th Aug 2016
Had issues with bolts slipping out and charging handles following. With this installed I can carry multiple uppers to the range and not worry about loosing pieces. They are a little hard to get on and off at first but once broken in they work great.