{"id":841,"date":"2020-08-24T11:33:54","date_gmt":"2020-08-24T11:33:54","guid":{"rendered":"https:\/\/c3junkie.com\/?page_id=841"},"modified":"2025-07-21T14:02:58","modified_gmt":"2025-07-21T14:02:58","slug":"45-acp-cmmg-rdb","status":"publish","type":"page","link":"https:\/\/c3junkie.com\/?page_id=841","title":{"rendered":"45 ACP CMMG RDB"},"content":{"rendered":"
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I initially had no desire to do a .45 ACP CMMG RDB setup because:<\/p>\n

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  1. I didn’t want to bother messing with trying to get it to work with a standard lower as the current mag options are maxed out at about 20 round capacity (Macon Armory proprietary mags or the USC mags).<\/li>\n
  2. I didn’t want to get another Glock lower just for this.<\/li>\n
  3. I no longer had my MGI Grease Gun magwell to use unmodified GG mags.<\/li>\n<\/ol>\n

    I happened to run across another MGI GG magwell so I decided to do a .45.<\/p>\n

    After all the issues I’ve had with the ejector springs dying in my 9mm and .40SW, I thought I would start out with a custom barrel with minimal headspacing slop.\u00a0 Although I will say that I haven’t seen any reports of ejection spring failures in .45ACP.\u00a0 Neither have any of my friends running the .45 RDB in full auto….but I don’t think any of them shoot the .45’s a lot.<\/p>\n

    Regardless, I decided to get a custom barrel made out of SS.\u00a0 Stainless because it would be easier to deal with if I wanted to port the barrel for an integrally suppressed upper.<\/p>\n

    So I purchased the Wilson Arms SS .45 ACP blowback barrel on sale for $80.\u00a0\u00a0\"\"<\/p>\n

    I purchased a 40\/45 3 lug adapter from Griffin Armament.\u00a0 Just the CMMG .45 ACP BCG ‘repair kit’ to primarily get the bolt only.\"\"<\/p>\n

    I also just got a standard M4 extension and sent it all to Rudy at\u00a0 https:\/\/maconarmory.com\/<\/a>
    \n\"\"<\/p>\n

    This is what I got back:
    \n\"\" \"\" \"\"<\/p>\n

    I’m using my preferred buffer tube, buffer and spring setup I use in the 9mm CMMG RDB which is:<\/p>\n

    Vltor A5 buffer tube (or equivalent length buffer tube)
    \nKynshot RB5007
    \n556 Tubb Flat spring<\/p>\n

    \"\"<\/p>\n

    Old Gemtech Blackside .45 ACP suppressor used with custom adapter made by Curtis Tactical to use the Grffin 3 lug mount.\u00a0 Interestingly, there is almost no change in the cyclic rate when suppressed while I see about a 60 RPM increase in 9mm.\"\"<\/p>\n

    I also tried some old 200Gr SWC profiled reloads and it ran those pretty well also.
    \n\"\"<\/p>\n

    \"\"<\/p>\n<\/div>\n

    Update 7\/20\/25<\/h1>\n

    I don’t shoot this setup much but decided to move to the fixed ejector setup since I can’t stand the spring loaded ejector of the old Guard \/ Banshee.<\/p>\n

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     <\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    I initially had no desire to do a .45 ACP CMMG RDB setup because: I didn’t want to bother messing with trying to get it to work with a standard lower as the current mag options are maxed out at about 20 round capacity (Macon Armory proprietary mags or the USC mags). I didn’t want …<\/p>\n

    45 ACP CMMG RDB<\/span> Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-841","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/c3junkie.com\/index.php?rest_route=\/wp\/v2\/pages\/841","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/c3junkie.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/c3junkie.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/c3junkie.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c3junkie.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=841"}],"version-history":[{"count":6,"href":"https:\/\/c3junkie.com\/index.php?rest_route=\/wp\/v2\/pages\/841\/revisions"}],"predecessor-version":[{"id":2830,"href":"https:\/\/c3junkie.com\/index.php?rest_route=\/wp\/v2\/pages\/841\/revisions\/2830"}],"wp:attachment":[{"href":"https:\/\/c3junkie.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=841"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}