RangerTrace Posted June 21, 2017 Share Posted June 21, 2017 I put another 200 rounds through my new CK Arms 9mm IDPA pistol yesterday. With a new style STI magazine, the slide locked back with a round in the magazine several times, but not every time. I removed the slide, installed the slide stop and noticed that the shelf of the follower does make contact with the slide stop with 1 round in the magazine, but not enough to pop the slide stop out of the detent. I used a dremel to remove some material from the shelf. Like a good hack, I removed a little at a time and checked to see if it still made contact with the slide stop. Ultimately, I went too far and most likely ruined the follower. Are the new MBX followers the answer? Will they work with the stock, new style STI magazines? Link to comment Share on other sites More sharing options...
RangerTrace Posted June 21, 2017 Author Share Posted June 21, 2017 The fine folks at Dawson Precision took the time to try this combination and advised the MBX Spring/follower combo WILL NOT work with the new style STI tube. MBX confirmed this when they answered by email. Link to comment Share on other sites More sharing options...
EEH Posted June 21, 2017 Share Posted June 21, 2017 I made a call to MBX and got the same answer. Link to comment Share on other sites More sharing options...
RaylanGivens Posted June 21, 2017 Share Posted June 21, 2017 I replace the MBX springs and followers with Grams springs in my MBX magazines... Actually I buy empty MBX tubes without springs and followers, but it's the same thing... Why don't you guys try Grams followers and springs? Link to comment Share on other sites More sharing options...
RangerTrace Posted June 21, 2017 Author Share Posted June 21, 2017 25 minutes ago, RaylanGivens said: I replace the MBX springs and followers with Grams springs in my MBX magazines... Actually I buy empty MBX tubes without springs and followers, but it's the same thing... Why don't you guys try Grams followers and springs? I've used them for years 40 Limited, but without follower mods, they can lock a slide back with 2 rounds left in the mag. Link to comment Share on other sites More sharing options...
RaylanGivens Posted June 21, 2017 Share Posted June 21, 2017 5 minutes ago, RangerTrace said: I've used them for years 40 Limited, but without follower mods, they can lock a slide back with 2 rounds left in the mag. Yes, you need to trim the follower tang that lifts the slide stop up... I also trim the slide stop... Insert an empty mag into the frame with the slide off and make sure the follower doesn't hit the slide stop... Link to comment Share on other sites More sharing options...
RangerTrace Posted June 21, 2017 Author Share Posted June 21, 2017 1 minute ago, RaylanGivens said: Yes, you need to trim the follower tang that lifts the slide stop up... I also trim the slide stop... Insert an empty mag into the frame with the slide off and make sure the follower doesn't hit the slide stop... Yes sir, I know how to keep it from locking the slide back. I want it to lock the slide back with an empty magazine...not with rounds in the mag. Link to comment Share on other sites More sharing options...
RangerTrace Posted June 21, 2017 Author Share Posted June 21, 2017 So, until I get this "lock back issue" fixed, what happens if during an IDPA match my slide locks back and I inadvertently drop a mag that has a round in it? Link to comment Share on other sites More sharing options...
RangerTrace Posted June 21, 2017 Author Share Posted June 21, 2017 After a few minutes on the phone with Beven tonight, I believe the only resolution for me is to tune the follower shelf and the slide stop. He admitted he, nor MBX could build a mag correctly for my IDPA needs. You would expect one to say a competitor couldn't do it, but I respect the heck out of a guy who says he can't do it either......and he's been building mags for a LONG time...... Link to comment Share on other sites More sharing options...
v1911 Posted June 21, 2017 Share Posted June 21, 2017 If your slide locks back and you drop the mag only to find there was a round left in the mag, you're ok. It's considered a malfunction and no PE will be assigned. Link to comment Share on other sites More sharing options...
RangerTrace Posted June 22, 2017 Author Share Posted June 22, 2017 30 minutes ago, v1911 said: If your slide locks back and you drop the mag only to find there was a round left in the mag, you're ok. It's considered a malfunction and no PE will be assigned. Did I mention that I love me some v1911!! Link to comment Share on other sites More sharing options...
davsco Posted June 22, 2017 Share Posted June 22, 2017 43 minutes ago, v1911 said: If your slide locks back and you drop the mag only to find there was a round left in the mag, you're ok. It's considered a malfunction and no PE will be assigned. +1 yep my sti tactical does this periodically. haven't taken the time to identify which mag(s) are the culprit. Link to comment Share on other sites More sharing options...
davidb72 Posted July 5, 2017 Share Posted July 5, 2017 On 6/21/2017 at 7:38 PM, v1911 said: If your slide locks back and you drop the mag only to find there was a round left in the mag, you're ok. It's considered a malfunction and no PE will be assigned. I could see that happening once or twice - but what if it happened every stage of the match? How would you handle that? Link to comment Share on other sites More sharing options...
v1911 Posted July 6, 2017 Share Posted July 6, 2017 As a competitor, I would be planning my stages around a division capacity start. So if my mags are not co-operating, chances are my game plan isn't going to go accordingly. If I was limited to only 3 mags that day and couldn't be without the faulty mag, then I would use it for my reload or as my 3rd. As an SO, if I saw a competitor having a legit problem with their mags, I'd offer some advise that would enable them to stay within the rules while avoiding any accusations of wrong doing. It's easy to spot a competitor having legit troubles. In this case, if I were running Trace and he went to slide lock prematurely, it would probably result in Trace trying to still squeeze off a round not realizing he's gone to slide lock. His natural reaction would probably be to drop the mag and reload. The SK would probably see that the recently dropped mag had ammo still in it. If he tried to give him a PE for it, I would be there to argue that the competitor had a malfunction. I'm one of those weird people that likes to assume the best in others. If it was found that a competitor was doing something to gain an advantage, I'd probably consult with the MD and see if a PE or possibly an FP were in order. Link to comment Share on other sites More sharing options...
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