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Posted: 11/27/2017 10:00:16 PM EDT
[#1]
Quote HistoryQuoted:
A standard upper works with the ejection port opened a bit Quote HistoryQuoted:
Originally Postezd By JwbTower:
What stripped upper do I use with the 45 BCG & Barrel package. On your website it mentions using the correct upper, but I'm not seeing the correct one. Does it just have an enlarged opening? Thanks Anything else I should consider? Thanks |
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Posted: 11/27/2017 10:30:16 PM EDT
[#2]
Quote HistoryQuoted:
I bought a MkGs T and I really like it. But I would like to build something more custom to my likes. I plan on getting the CMMG barrel/BCG and the CMMG lower. I have found a 5.56 side charger upper that I like. It has the M4 ramps, forward assist and dust cover. Would this work OK with my build? I'm ready to get building. :-) Anything else I should consider? Thanks Quote HistoryQuoted:
Quoted:
Originally Postezd By JwbTower:
What stripped upper do I use with the 45 BCG & Barrel package. On your website it mentions using the correct upper, but I'm not seeing the correct one. Does it just have an enlarged opening? Thanks Anything else I should consider? Thanks 
I will be running a knights urx4 10.75” rail with the 8.5” barrel and run my tirant 45 suppressor until my omega 9k gets transfered and sits in jail for a year  . I also bought a sb pdw brace. It will cost more than a complete factory built gun but I already had a bunch of parts. I got notice today everything should ship mid December.
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Posted: 11/28/2017 12:15:31 AM EDT
[#3]
Quote HistoryQuoted:... I ordered a 9mm lower, the bcg/barrel and weight set. I already have a upper I figured I would try it first. Watching youtube videos I can see where they milled the upper ejection port area in front of the dust cover detent catch. Pictured below
https://pbs.twimg.com/media/DOklIZaWkAALQSa.jpg ... Would that allow for the 9 mm slick side uppers with the small (in length) ejection port areas to work? CMMG? A slick sided upper would be something. I can see a lot of barrels/BCG/lowers being sold. What would be the package part number for that? ;-) Would we really need a dust cover and forward assist? |
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Posted: 11/29/2017 12:07:52 AM EDT
[#4]
Quote HistoryQuoted:What would be the package part number for that? ;-)
Would we really need a dust cover and forward assist? And the working forward assist is a feature that puts this ahead of all other 9mm ARs. I'd like to see a gas shield though... |
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Posted: 11/29/2017 3:00:11 AM EDT
[#5]
Now I see how I missed the delayed radial blowback info...never realized that's what this thread was about!
Any pics showing what the non-business end of the 9mm barrel looks like? Is it just like a regular DI barrel but chambered for 9mm? |
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Posted: 11/29/2017 10:21:28 AM EDT
[#6]
Quote HistoryQuoted: Who would buy an AR without a dust cover? Are we trying to save 75 cents?
And the working forward assist is a feature that puts this ahead of all other 9mm ARs. I'd like to see a gas shield though... Plenty of ARs have been sold w/o a dust cover in recent years to meet a price point, and the average user doesn't really need a dust cover. In a year of selling guns, I think I met 2 customers who actually needed a dust cover for their AR usage. |
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Posted: 11/29/2017 1:21:33 PM EDT
[#7]
I was able to take out my CMMG Guard 9mm and .45 today. I shot them both with and without suppressors. Factory Winchester white box and my loads using VV N320 powder. It's pretty much a toss up. They both are plenty quiet. The 9mm is slightly quieter to the shooters ear but my 9mm can is much better than my .45. The recoil on both were very mild. The 9mm was a tad faster/sharper but less than the .45. The .45 was slower but more push if that makes any sense. To be honest I like the .45 a little better but if I had bought only the 9mm I would be completely happy. The fact that the 9 uses factory Glock 33 round mags is certainly one advantage. The Kriss extensions work for the .45 but require a slight mod to the factory glock 21 mag. The SGM .45 mags worked the one time I tried them but I need to use them more before I call them reliable. The .45 I had refinished in 80% burnt bronze and 20% black after I had it engraved to SBR.
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Posted: 11/29/2017 9:40:59 PM EDT
[#8]
Quote HistoryQuoted: To be fair to the other 9x19mm ARs, they're mass-delayed blowback (straight blowback), and don't need a forward assist. Plenty of ARs have been sold w/o a dust cover in recent years to meet a price point, and the average user doesn't really need a dust cover. In a year of selling guns, I think I met 2 customers who actually needed a dust cover for their AR usage. RGR, got it. |
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Posted: 11/29/2017 9:45:14 PM EDT
[#9]
Quote HistoryI was wondering if there was some reason it was not included in the new 9mm Guard (I never paid any attention to the old one)- like spring ejection happens further back in the cycle than fixed ejection? It would appear not... |
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Posted: 11/29/2017 10:34:48 PM EDT
[#10]
Quote HistoryQuoted:
Did the .45 come with the gas shield installed, or did you add it? I was wondering if there was some reason it was not included in the new 9mm Guard (I never paid any attention to the old one)- like spring ejection happens further back in the cycle than fixed ejection? It would appear not... Quote HistoryQuoted:
Did the .45 come with the gas shield installed, or did you add it? I was wondering if there was some reason it was not included in the new 9mm Guard (I never paid any attention to the old one)- like spring ejection happens further back in the cycle than fixed ejection? It would appear not... We did test the rifles with the deflector. Current blowback style deflector with RDB would periodically bounce empty case back into action. Didnt happen often, but it did happen. I suspect a small variation in gas deflector angle would take care of this. We weren't worried about testing it more since RDB got rid of much of the gasses. |
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Posted: 11/29/2017 10:35:18 PM EDT
[#11]
Quote History Dupe
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Posted: 11/29/2017 10:38:37 PM EDT
[#12]
Quote HistoryQuoted: Did the .45 come with the gas shield installed, or did you add it? I was wondering if there was some reason it was not included in the new 9mm Guard (I never paid any attention to the old one)- like spring ejection happens further back in the cycle than fixed ejection? It would appear not... |
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Posted: 11/29/2017 11:16:05 PM EDT
[#13]
Quote HistoryQuoted: I put it on the .45 when I bought it because like you (I believe) I am a lefty. CMMG- since you are already making your own style of gas shield (I think?), it would be cool if you offered one (as an accessory) that used maybe 90% of the original port door instead of 60%. |
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Posted: 11/29/2017 11:16:07 PM EDT
[#14]
Quote HistoryQuoted:
I was able to take out my CMMG Guard 9mm and .45 today. I shot them both with and without suppressors. Factory Winchester white box and my loads using VV N320 powder. It's pretty much a toss up. They both are plenty quiet. The 9mm is slightly quieter to the shooters ear but my 9mm can is much better than my .45. The recoil on both were very mild. The 9mm was a tad faster/sharper but less than the .45. The .45 was slower but more push if that makes any sense. To be honest I like the .45 a little better but if I had bought only the 9mm I would be completely happy. The fact that the 9 uses factory Glock 33 round mags is certainly one advantage. The Kriss extensions work for the .45 but require a slight mod to the factory glock 21 mag. The SGM .45 mags worked the one time I tried them but I need to use them more before I call them reliable. The .45 I had refinished in 80% burnt bronze and 20% black after I had it engraved to SBR. https://i.imgur.com/h8ZYPlg.jpg?1 |
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Posted: 11/30/2017 9:53:16 AM EDT
[#15]
Quote HistoryQuoted: What mod is needed for the Glock mags / kriss extension? Anyway, I have 4 of these now and they work flawless with that slight mod. I realize this is one of those easier to see than explain with words. If the above does not make sense I will take one apart this weekend and snap a few pictures. |
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Posted: 12/6/2017 11:46:58 PM EDT
[#16]
CMMG
Really wish you would sell the stripped Guard lower receiver to us here in California. It can legally be made in to a "featureless" California legal rifle even with the proprietary magazine release. When built as a "featureless" legal rifle it does not need any type of magazine lock. I would have bought a 9mm and .45 stripped lower already as would many of my friends and colleagues. Don't be scared of California CMMG we love our guns too. Too bad.... |
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Posted: 12/7/2017 6:36:11 PM EDT
[#17]
Quote HistoryQuoted:
CMMG Really wish you would sell the stripped Guard lower receiver to us here in California. It can legally be made in to a "featureless" California legal rifle even with the proprietary magazine release. When built as a "featureless" legal rifle it does not need any type of magazine lock. I would have bought a 9mm and .45 stripped lower already as would many of my friends and colleagues. Don't be scared of California CMMG we love our guns too. Too bad.... |
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Posted: 12/7/2017 9:33:36 PM EDT
[#18]
For those that have one, do you recommend sticking with the H1 buffer and a regular carbine spring, or using some different combination of heavier buffer or XP spring?
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Posted: 12/7/2017 11:00:44 PM EDT
[#19]
Quote HistoryQuoted: CMMG does sell lower groups on-line. https://www.cmmginc.com/product/lower-receiver-assembly-mkg/ Not to California they don't. Already tried |
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Posted: 12/7/2017 11:52:12 PM EDT
[#20]
Quote HistoryQuoted:
For those that have one, do you recommend sticking with the H1 buffer and a regular carbine spring, or using some different combination of heavier buffer or XP spring? With the BCG design I don't see why you would want to go with a heavier buffer than comes with their guns. [Disclaimer: I don't have the .45 version] |
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Posted: 12/7/2017 11:55:02 PM EDT
[#21]
Quote HistoryQuoted:
CMMG Really wish you would sell the stripped Guard lower receiver to us here in California. It can legally be made in to a "featureless" California legal rifle even with the proprietary magazine release. When built as a "featureless" legal rifle it does not need any type of magazine lock. I would have bought a 9mm and .45 stripped lower already as would many of my friends and colleagues. Don't be scared of California CMMG we love our guns too. Too bad.... 
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Posted: 12/16/2017 7:34:08 PM EDT
[#22]
Waiting on my Guard 9mm barrel and BCG to arrive.
Have a plan to be able to feed it with Colt-pattern mags from a mag block. It should be much lighter and less recoil than my current blowback setup. I can hardly wait... |
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Posted: 12/16/2017 7:38:52 PM EDT
[#23]
Quote HistoryQuoted:
Waiting on my Guard 9mm barrel and BCG to arrive. Have a plan to be able to feed it with Colt-pattern mags from a mag block. It should be much lighter and less recoil than my current blowback setup. I can hardly wait... |
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Posted: 12/16/2017 7:41:19 PM EDT
[#24]
Quote HistoryQuoted:
Waiting on my Guard 9mm barrel and BCG to arrive. Have a plan to be able to feed it with Colt-pattern mags from a mag block. It should be much lighter and less recoil than my current blowback setup. I can hardly wait... |
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Posted: 12/17/2017 11:55:58 AM EDT
[#25]
Quote HistoryQuoted:
Looking forward to seeing how you make it work with the Colt mags! The mag needs to sit about .100" lower so the bolt lugs pass between the feed lips. Will modify the catch slot to let it sit lower. Hand-testing shows no feed problems. The front of the CPD mag follower had to be rounded so as not catch the back of the bolt lugs when empty. I'll re- check once the parts get here, cut a mag and test. Provably gonna cut the barrel to 5 to 6 inches. Will get some pics and video. |
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Posted: 12/17/2017 12:01:58 PM EDT
[#26]
Quote HistoryQuoted:
The mag needs to sit about .100" lower so the bolt lugs pass between the feed lips. Will modify the catch slot to let it sit lower. That's a bold move, Cotton... |
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Posted: 12/17/2017 1:36:15 PM EDT
[#27]
Quote HistoryQuoted: So you're planning to have all your rounds ride the ramp hard? That's a bold move, Cotton... We'll see if it works or not. The feed geometry looks ok and it strips and feeds rounds easily. Obviously, the bolt can't close all the way in my testing so far. |
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Posted: 12/17/2017 2:50:41 PM EDT
[#28]
Quote HistoryQuoted:
Well, We'll see if it works or not. The feed geometry looks ok and it strips and feeds rounds easily. Obviously, the bolt can't close all the way in my testing so far. |
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Posted: 12/17/2017 8:59:56 PM EDT
[#29]
Quote HistoryQuoted:
We'll see if it works or not. The feed geometry looks ok and it strips and feeds rounds easily. One issue that may effect you is that all 9mm Blowback ARs have a moment in time during cycling where the round is free of control- either the lips or the extractor claw- and not-yet-in-the-chamber. 5.56 rounds are entering the chamber as the case rim clears the lips. |
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Posted: 12/18/2017 12:43:54 PM EDT
[#30]
Quote HistoryQuoted: Definitely let us know how it works out. One issue that may effect you is that all 9mm Blowback ARs have a moment in time during cycling where the round is free of control- either the lips or the extractor claw- and not-yet-in-the-chamber. 5.56 rounds are entering the chamber as the case rim clears the lips. Now, if my parts would hurry up and get here... |
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Posted: 12/18/2017 12:53:31 PM EDT
[#31]
Quote HistoryQuoted: It's working so far in my mockup tests. Now, if my parts would hurry up and get here... |
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Posted: 12/19/2017 10:09:06 PM EDT
[#32]
Quote HistoryQuoted:
FWIW, I contacted CMMG last Monday about the 9mm kits and they said it would be "2 weeks or less". Hoping they ship later this week. |
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Posted: 12/20/2017 2:40:51 AM EDT
[#33]
Really? I just got a UPS shipment notification today. I ordered mine about 4 weeks ago.
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Posted: 12/22/2017 8:45:30 PM EDT
[#34]
Parts arrived today.
Everything fit as expected. Cut mag catch notch .080" higher. Rounds feed like butter. LRBHO functions as expected. Need to live-fire test... |
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Posted: 12/22/2017 10:01:29 PM EDT
[#35]
Quote HistoryQuoted:
Parts arrived today. Everything fit as expected. Cut mag catch notch .080" higher. Rounds feed like butter. LRBHO functions as expected. Need to live-fire test... |
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Posted: 12/23/2017 12:36:12 PM EDT
[#36]
Quote HistoryQuoted: Super interested in this. I'd love to have a summary/diagram of the steps needed too make this work. |
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Posted: 12/23/2017 12:50:13 PM EDT
[#37]
Quote HistoryQuoted:
The best way to make it work is to buy the CMMG lower too. That's what I decided after buying the rifle and seeing the engineering they put into it to make it reliable. Quote HistoryQuoted:
Quoted: Super interested in this. I'd love to have a summary/diagram of the steps needed too make this work. I already have standard lowers registered as SBRs and select-fire lowers with standard magwells. The blowback system worked but had more weight and recoil so I wanted to use the Radial Delyed system. |
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Posted: 12/23/2017 8:43:22 PM EDT
[#38]
Quote HistoryQuoted: Of course, that's the path of least resistance. I already have standard lowers registered as SBRs and select-fire lowers with standard magwells. The blowback system worked but had more weight and recoil so I wanted to use the Radial Delyed system. |
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Posted: 12/23/2017 10:37:32 PM EDT
[#39]
Quote HistoryQuoted:
Parts arrived today. Everything fit as expected. Cut mag catch notch .080" higher. Rounds feed like butter. LRBHO functions as expected. Need to live-fire test... |
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Posted: 12/24/2017 10:17:30 AM EDT
[#40]
Quote HistoryQuoted:
I am in the same boat. Quote HistoryQuoted:
Quoted: Of course, that's the path of least resistance. I already have standard lowers registered as SBRs and select-fire lowers with standard magwells. The blowback system worked but had more weight and recoil so I wanted to use the Radial Delyed system. At this point if I want a new caliber upper that isn't blowback I contact Rudy or Ron Williams and have them do one in DI that'll work with an existing SBR'd lower. |
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Posted: 12/24/2017 10:21:34 PM EDT
[#41]
Quote HistoryQuoted: Same same. At this point if I want a new caliber upper that isn't blowback I contact Rudy or Ron Williams and have them do one in DI that'll work with an existing SBR'd lower. |
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Posted: 12/24/2017 11:01:28 PM EDT
[#42]
Quote HistoryQuoted:
Thought about that but, apparently, the 9mm DI is very ammo senitive. Quote HistoryQuoted:
Quoted: Same same. At this point if I want a new caliber upper that isn't blowback I contact Rudy or Ron Williams and have them do one in DI that'll work with an existing SBR'd lower. |
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Posted: 12/27/2017 9:49:13 AM EDT
[#43]
Anyone have a picture of the guard feed ramps going into the barrel?
Would be interested in seeing a good picture. |
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Posted: 12/27/2017 1:28:00 PM EDT
[#44]
Finally got a new image host... |
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Posted: 12/27/2017 3:09:51 PM EDT
[#45]
Quote HistoryQuoted:
Anyone have a picture of the guard feed ramps going into the barrel? Would be interested in seeing a good picture. I have a Guard 9mm rifle complete and after I tested everything I bought a barrel, BCG and lower to build a pistol. While I highly recommend using their lower, there are others that are using their lowers (because of SBR?) and having success. They have to work around overseating the mag (need mag stop) and LRBHO. |
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Posted: 12/27/2017 3:12:04 PM EDT
[#46]
Thanks for the pictures but it doesn't show the barrel extension and feed ramps. I don't think it's the same as a M4, maybe modified like the bolt. That's what I'm curious about.
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Posted: 12/27/2017 4:21:37 PM EDT
[#47]
Quote HistoryQuoted:
Thanks for the pictures but it doesn't show the barrel extension and feed ramps. I don't think it's the same as a M4, maybe modified like the bolt. That's what I'm curious about. |
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Posted: 12/27/2017 4:50:33 PM EDT
[#48]
IT must be ground down some because I'm running their lower with a similar modification to the bolt and it's jam city in a standard M4 Barrel extension. Pictures would help.
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Posted: 12/27/2017 5:15:11 PM EDT
[#49]
I'll try to take a picture tonight.
Can you describe your setup a little more? You're using a Guard lower with a modified (non-CMMG) bolt and barrel? |
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Posted: 12/27/2017 8:04:32 PM EDT
[#50]
Quote HistoryQuoted:
Thanks for the pictures but it doesn't show the barrel extension and feed ramps. I don't think it's the same as a M4, maybe modified like the bolt. That's what I'm curious about. 
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