I didn't diem know these existed but i searched it and found it. It perfect, exactly what i was looking for.
TopStop AR Upper Receiver Cover
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.
Fits great! I like it!
Whether you're storing uppers in the safe or making transport simpler for a day at the range taking one lower to run several calibers from, or using a bag that doesn't allow for fully assembled AR, this makes the process smoother. Transporting and storing uppers, off of lowers is simpler and cleaner. I picked up one of these a few years ago and it has proven invaluable for containing mess and protecting. I'm glad to see the new price point which makes this product make sense; I just snagged a couple more.
I wanted a solution that would allow me to fit full size carbines and rifles a bit move covertly in 22-29" discreet cases and also have the ability to bring around spare uppers without BCGs falling out and or getting grease and oil on everything. I found these about a year ago and picked up several. Recently picked up a dozen more. These are consistently excellent fit, non-marring, great sealing option. Highly recommended.
This is an excellent way to protect your AR BCG and keep everything in one place, charging handle and BCG. I you have multiple uppers this device will keep your AR's upper innards safe. It looks great too. No pins you use. Easy to attach and detatch. Sturdy material.
They work great! As advertised they lock onto the bottom of my uppers keeping the good junk in and not the outside dirt and grime. Seventy five percent of the time that I would grab an upper to mess with the bolt would slide out and almost kill a toe. Especially the pistol caliber bolts. They are just heavy enough to break free from the dust cover tension and blam! That used to be a toe!!! Simple but great device.
I purchased this to keep dust and dirt out and lube in my gun during transport to the range. I carry my rifle broken down in a backpack on my motorcycle. Works perfectly for what I need. I do wish there was something for the lower to protect my Geissele trigger pack but otherwise great product.
I have several dedicated purpose uppers and needed something to protect the internals from getting garbage in them, I tried a different top receiver cover first and it just didn't stack up. This cover is rigid, holds on tight, but still is quickly removable. Well worth the money for storing a gun broken down or as a way to keep a second upper clean and ready.
Super simple; slap it on and it covers your upper receiver. No pins to lose like the bolt savers. Grabs on via the rear receiver pin hole; the inner lining is dimpled a bit so that it locks into the pinhole. Doesn't grab at the front, but slips in and forms a nice seal with the receiver.. It's a little stiff at first to get off, but this breaks in with time.
I have a 9mm ar15 that Is broken down to fit in a discrete case. I wanted something that would keep the bolt from slideing out of the reciver and also keep lubricant off the case The upper reciver is a side charging New Frontier Armory,the topstop cover fits perfectly holds on great but comes off with ease for quick assembly .this accessory works as described I like and recommend it!