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Old January 9, 2021, 09:00 AM   #35
Senior Member
Join Date: November 17, 1999
Location: NW Wi
Posts: 1,286
Have owned several M1 carbines, but am not a historian by any means. My understanding is the M1 was designed for the 15 rd mags, while the M2 was designed to also use the 30 rounders. To get my M1 carbine to reliably hold the bolt open on 30 rd mag, needed to install a bolt catch that originally came with M2's. Yes it works on both, but seems to have been originally installed on the M2.
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