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Try First Samco, now they're called CAA I believe, I use there couplers entensively with no issues. I have also used the Mag grip coupler, very strong and easy to use(have two left for sale check the EE) There's the mag cinch product, I don't overly like it, requires a bit of work to get them set-up right and they tend to be quite expensive. The cheap choice is the spring steel version favored by the Israeli's as well as a similar copy made by a company called Mason. there's some links below.