itzjere

MBX tubes with Grams spring and follower

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Anybody having issues with the MBX 18 round 45 ACP magazines. I really have to slam them into the gun to lock in place. Sometimes I need to slam it in 2-3 times to seat the magazine. I believe they are 141.25 mm in length. Help if you can.

Thanks

Mike

 

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On 3/16/2017 at 0:46 PM, mlm said:

Anybody having issues with the MBX 18 round 45 ACP magazines. I really have to slam them into the gun to lock in place. Sometimes I need to slam it in 2-3 times to seat the magazine. I believe they are 141.25 mm in length. Help if you can.

Thanks

Mike

 

Are the mags full to capacity?

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I ran one 9/38 140 all last season with the grams guts... No issues what so ever... I've since switched all my mags to grams guts... So far so good 

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Posted (edited)

I'm using grams 13 coil in my 9mm 140mm mbx ,work perfect so far even with short factory ammo fit 22 reloadable 23 is tight.

Edited by Garmil

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Are the mags full to capacity? From FullMetalJacket

 

yes they are. 18 +1. Also it will happen with 16-17 +1 in the throat.

Mike

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I was informed before that grams spring and followers will not work on mbx. It seems they are good to go

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Ya I called grams to order some spring kits and the owner made a big effort to convince me that he wasn't a fan of the mbx mags and that his followers would not work well in them...

That said I have one FKS kit for a 170 mbx and after trimming the slide stop portion off I've found it to hold 29rnds of 9mm, just like my stock follower, and so far (admittedly very few rounds at this point) it's been reliable. Also, this is just a "feeling"- the follower seems much more stable than the stock one, like it wld be less likely to flip and seize up like my stock follower had done a few times


Sent from my iPhone using Tapatalk Pro

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I run 2 MBX mags with Gram's spring and followers, they run with no problems. I use the FKS-13 (I think) kit and it works with no problem. I get 29 reloadable. I won't fully switch to them until I get a chance to try the new STI tubes.

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Grams springs and followers are a better design, problem is the mbx tubes are too wide internally, which is one of the reasons why beven will never recommend using his stuff in an mbx tube.  Beven designed his spring and follower to work in a tube (sti, svi, sps) within a certain spec width; that correlates with the dimensions of the double stack of rounds for the caliber designed for that tube.

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