Bought myself a polycarbonate lens protector for my Maverick Gen IV. It had a kill flash but they kind of annoy me a bit but also didn't want to use the waste of time acrylic ones you put on the rail as they only last a single hit.
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I got this from a shop on Ebay called Red Dot Engineering. He offers set sizes for specific sights but you can also do custom sizes for scope and the like. Reasonably priced, this one was £9.99 with free postage. Wanted to post here as its have found finding polycarbonate protectors to be very annoying. These have been tested point blank with a 500fps sniper shot and has not shattered. This guy has sold almost 6000 of these and has 6588 positive feedback (100%) highly recommend
Here's the link :
https://ebay.io/m/qVAqa7 (let me know if not allowed and ill remove)
Note: I am not affiliated, friends with the seller or getting anything for this. Just wanted to share as I know sight guards are difficult to find at times