Substituting GSG-5 mag springs off HKParts into the CMMG Mk4 22lr magazines creates enough force to work the Catch22 bolt catch and successful stop the CMMG 22lr bolt, at least manually.
Will post live fire test results later.
#cmmg #ar22 #gsg5 #hkparts #catch22 #boltcatch #ar15 #arconversion #magazine #22lr #rimfire #conversionkit
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