The rubber bikini caps seem to be the only thing I've found that won't pull off in the thick tight crap, actually hold some form of useful seal on the scope and stop crap and junk getting on the lenses, don't flick off and most importantly are reliably silent to open. Take from that what it's worth, I've used pretty much everything else. The neoprene covers are worth their weight in gold in the gunsafe though. I've had rain get into the flip up caps somehow, and cover the objective. The bikini cap can be left on the scope by just pushing it down at front and back, but it can foul up the action which is pesky. As noted, everything pretty much sucks in some form or another...
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