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Tim, the Colt and HK Magazines for the M4/416 should work in it as well as they all use the same system since they were produced by Walther Germany. Cheers and stay safe!

Tim, looks like they're proprietary. You can contact Walther arms at 479-242-8500 or email them at ( customerservice@waltherarms.com ) and see if they know of any compatible Magazines. Sorry but hope this helps.

Tim, HK 416 .22, G36 .22 & Colt M4 and other Umarex/Walther/HK .22 Rifles all use the same magazines as the Hammerli Tac R1. Have a great day!