Nice work! I'll be looking for a black one when they are ready👍🏻
John

Don't know about the karr mags, but the glock 43 springs I got from Ghost Inc.  (3 for $7.95). Work very well. I clip off the bottom coil...it has a bit of a hook and is the 14th coil...the new factory ones Rem sent me had13.  The new mags they sent me also  had exactly parallel lips ....to the thousandth.
John

Well I had installed aftermarket Glock springs with a heavier wire...supposed to be a 15% or so increase... I lopped off one coil as the were way too tight and these work good.  Now the new mags the folks at Remington sent me have 13 coils...and these have run without a hitch
John

Hey gang
So here is the latest.. Remington actually sent me two new mags...they weren't off the rack in blister packs...hand pulled.   I checked the specs ..13 coils to the mag spring and what do you know...the lips are exactly 0.351. Front and back, perfectly parallel.
Went to the range on Tuesday and put a 100 rounds through each without a single hiccup...
So,maybe, just maybe they were listening when I was talking to them...
Also I did not modify the tab retaining the follower on these..shot all fmg that day, so I don't know if hp rounds will hang on them...next trip to the range I'll see.
Y'all take care and have a great 4th
John

Well here's an update.. Remingtonreplied to the emai I sent and asked me to call em...I had filled them in specifically on th different springs that were in my various mags.  Fellow I talked to was nice enough, but didn't know much about guns...he couldn't answer me on how many coils should be in 5he magazine spring and said he would have to check with engineers...but he is sending me two new mags and said that they would be checked out ...will not be surprised to get two new bubbl e packed mags that no one looked at!  Regardless, at least we know how to fix em.
Have a good weekend folks
John

Well gang...I just got 2 mags in from grabagun...in the Rem packaging. Of course I did a quick check of lip measurements
One is 0.53 at the rear and 0.340 at the front; the other 0.351 at rear and 0.345 at front...definitely closer to parallel than the ones that came with the gun last year.  Just because, I popped it open and checked the spring... one has 12 coils...the other 13...what the hell!
Gonna leave em as is ant try em on the range before working on them...but why can't the get the springs to be the same...just don't get it...
John

Excellent!!  Will be watching for it...was thinking of fabricating a prototype myself, but will hold off...I saw his threaded barrels on here...looks interesting.
Thanks
John

Interesting ... makes sense on their part...but if they want to go that route they need to lose the plastic base cap and follower...I've only put about 300 reds through mine and the drop surface of the follower shows scoring which I diligently polish off when cleaning.   So the 45 makes a good go-no go gauge...nice!
Will use that approach. Thanks
John

Nope, that makes sense.  I have noticed the rounds don't lay flat inside the mag too. I've jus been setting to the back and one side withe a smack and they seem to stay in line...whether they stay 5hay way in use...got me.   We'll see how it goes.
Take care
John

Quote from: mr220v on June 01, 2018, 07:24:09 PM
Main obstacle to r51 accuracy is the trigger.  Dry fire it and notice how much the site picture moves around.  Practice reducing the movement.

Yeah...not a fan of the plastic trigger....I swear I feel a flex in it when slow firing.. Anyone heard anything about a aluminum aftermarket trigger for this pistol.
John

Oh, for 5hose interested... the Glock springs spec out 0,0433" dia stock and the rem springs are 0.0423...
J

Yeah Joe I really wonder about the mag 2...the setup was all boxed up and wrapped so I wouldn't gave given it any thought...until I took the mags apart!
How did you determine there was a friction fit of the shells on the ridge through the length of the mag.  I ran an inside mic down the length but it stayed t though greater than cartridge width... couldn't detect any friction there?  I'm gonna adjust the lips and retainer shape but not vice the thickness and see if it plays well...and of course swap out the springs in both.  I got 2 "new "mags coming from grabagun...we'll see,  onl6 realized when they charged me tax 5hey were 10 miles away...will go visit.
John

Got something for you...I saw on another thread (sorry couldn't find it again when I looked to quote it) y'all were talking about trying. Believe it was a SW spring in the mag... well that got me looking an I found the Glock 43 Mag spring is almost identical to the R51. See image
Got them from Ghost Inc
https://ghostinc.com/glock-43-plus-15-magazine-spring/
I picked up a 3 pack for $8.  They are a plus 15% strength...has 14 coils
Only thing I did was trim a little bend from the bottom base coil that interfered with the magazine bottom.  Fits fine, no problem loading 7 rounds and it seems to me that the rounds maintain the proper angle with the follower.
Loads  fine cycling by hand...
So this might be an option...will try live once I get time to fix up the lips on the mags and can get to the range...will be a little while.
Hope this is of interest
John

Ok that table looked like hell
Let's try this


Mag dimensions
                       
Lips (Rear)  Mag 1  0.361   
                    Mag 2   0.359
      (Front)   Mag 1.  0.354       
                    Mag 2   0.334

Width
(Top rear)  Mag 1  0.594   
                  Mag 2  0.595
(Top front) Mag 1  0.585     
                  Mag 2. 0.586   
At follower groove

(Bottom rear)  Mag1  0.590     
                       Mag 2  0.590
(Bottom front) Mag 1  0.584   
                       Mag 2. 0.585       

Hey all,
I have found this post very enlightening...thanks to all that contributed!  So...spec'd out the dimensions of my two factory mags that came with the purchase last June.  After reading the various posts I expected weirdity...but this is amazing.  Below are the dimensions I got

Mag dimensions
                         Mag 1.            Mag 2
Lips (Rear)      0.361          0.359
        (Front)     0.354             0.334

Width
(Top rear)         0.594             0.595
(Top front)        0.585             0.586   At follower groove
(Bottom rear)    0.590            0.590
(Bottom front)   0.584            0.585

Although the box dimensions are within a thou, the lip dimensions are radically different between these mags and of course the reverse taper y'all pointed out is there...extreme in Mag 2.  The retainer tab is pronounced and is in need of some judicious grinding and polishing.  No surprise, Mag 2 was a worse troublemaker than Mag 1...lots of nose diving and hang ups on the tab, especially with +P hollow points.
But, that's not the most remarkable find...the mag spring dare suffer to between the 2 mags. If this works an I can post a pic you can see the mag 2 spring is one coil less than Mag 1 and it was a really contorted profile.   On top of that the Mag1 spring was in backwards not in line with the angle of the follower...was this what folks got with the gen 1 guns.