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FWIW I picked up a hard case from Super Cheap that takes a couple of ARs easily on special for $170 down from the usual $200 - it's a cheap version of a Pelican I guess but the special is on for...

Pull ya spring out, get a handful of grease and slather it with the stuff
Messy but it works

P Mag copy I think

AR-15 Spear Mag 10 RND MAGAZINE BLK

That was a bloody good vid
I hadn't heard of the blob of clay trick on the buffer before