LAR mag + Cprod Tactipuls won't drop free ! I WON !

Magazines bulging?

When adding the Tactipuls, does it limit the capacity to 9 rounds like the Magpul Ranger Plates?

Does it make it harder to get 10 rounds in if the answer to the above is no?

Does it make the mags harder to seat on a closed bolt?

Do they drop free when empty, or is the problem only when loaded, and is there a cut off point, ie X number of rounds in the mag?

Have you tried this in more than one magwell, and especially with different makes of lowers?

I am thinking that the extra pressure is causing the mag to bulge and stick in the magwell, but this would only usually apply if the mag was full, or near full; although if it was kept full for long enough it might stay that way, but has obviously not happened in your case, as it does not stick when the plate is changed.

Regards.

Mark
 
MWL said:
When adding the Tactipuls, does it limit the capacity to 9 rounds like the Magpul Ranger Plates?

Does it make it harder to get 10 rounds in if the answer to the above is no?

Does it make the mags harder to seat on a closed bolt?

Do they drop free when empty, or is the problem only when loaded, and is there a cut off point, ie X number of rounds in the mag?

Have you tried this in more than one magwell, and especially with different makes of lowers?

I am thinking that the extra pressure is causing the mag to bulge and stick in the magwell, but this would only usually apply if the mag was full, or near full; although if it was kept full for long enough it might stay that way, but has obviously not happened in your case, as it does not stick when the plate is changed.

Regards.

Mark
Click to expand...

Capacity is still 10

Harder to seat on closed bolt on my Norc, no issue on the DPMS. I can get it to seat in the Norc but I have to pop it from the bottom. Not ideal but workable. I may be able to trim the follower a bit to make it work better, there was a thread a while ago about that.

They won't drop free with Tacpuls when empty or full.

Won't drop free from my Norc or DPMS (DPMS has a tighter magwell. I had to give more "love" to my Pmags to get them to drop free). No issue on either with the normal floor plate.

I have to assume that the Tacpulls are causing a bulge, especially since it goes away when I put the regular bottom plate on. I'd like to keep the tacpulls on since it makes it easier to remove from my pouches and if there is a FTF, there is something to grab to rip out the mag if needed.

Perhaps I need to trim a coil of the spring?
 
I'm not sure how the Tactipul would cause it to bulge high enough up the mag body to cause the sticking, unless it is spreading the side walls out so much at the base, that it spreads the wall higher up, but that would probably be noticeable.

Do you have calipers that you can measure the mag dimensions both with and without?

I don't think trimming the spring would make any difference to it if that was the case that the Tactipul was causing the spreading. Especially if the mag is empty and it is still sticking.

Regards.

Mark
 
I measured the side walls of an LAR with and without the tacpull. With the pull, the mag swells about 0.04 inch in width.

It has to be the way in compresses the spring. I took the spring and follower out of one mag and put the tactpull back on. No swelling of the mag body.

Has anyone actually run into this before and solved the problem?
 
I didn't have any problems with the LAR-15s with Magpul Ranger Plates added, and they probably sit deeper into the mag body than the Tactipuls, as it was not possible to get 10 rounds into the mag with them on.

I had to dremel 5mm off the bottom of both ends of the follower in order to get 10 rounds in and allow it to seat on a closed bolt (10.5 capacity). This would lead me to expect that the spring would be even more compressed with the Magpuls than the Tactipul, and I never noticed any bulging or had any difficuly with dropping free (full or empty) from a half dozen Sabre lowers and a couple of RRA "pistol" lowers, although the RRAs were a bit tighter in the magwell than the Sabres.

If the bulge is being caused by the spring being compressed a bit too much even when empty, the mags must really be bulging when you shove 10 rounds in (I'm assuming the measurements were taken with empty mags). In that case, I would expect to see the same (or worse) bulging appear with 1 round and the standard base, as this would compress the spring more than an empty mag with the Tactipul added.

That's what leads me to think that there might be something caused by the interaction between the Tactipul and the mag rather than excessive spring tension. Perhaps it is causing an issue with how the spring is sitting against it?

My concern with trimming the spring, is that it won't sove the problem of dropping free with even 1 round in, as it will be under the same amount of tension as before you trimmed a coil, and then you might start to get issues with feeding the last couple of rounds and with the bolt locking back on an empty mag.

If I can think of anything else, I will let you know.

Regards.

Mark
 
Mark

Your points are valid. I could be the bottom of the tactipul which has a raised rib to hold the spring. It seems to hold it fine but maybe it is cocking the spring to the side. The normal floor plate is flat so the spring can adjust itself side to side against the inside of the mag well.

I may take a grinder the raised rib and make it smaller (or remove it completely) to see if that makes a difference.
 
Not having any Tactipuls, I can't really say.

I would think that trying that would be better than chopping your spring, as you can still buy more Tactipuls from Questar, the springs, not so much.

Regards.

Mark
 
I finally Won

Okay, fixed.

Spent about an hour trying different things to see if I could figure out what was causing the mag to budge when the tactipul was added and the spring was in the mag.

Finally I noticed that rib in the bottom of the 'pull had to catch the spring as it was slid in place, causing the spring to "bend" toward the front of the mag. The appears to cause more pressure on the back of tactipul and buldging the mag wall.

Here is the rib on the tactipul

DSC01237.jpg



So what happens if I trim the rib so the spring is not grabbed ? Hmmmm, dremel time.

The first attempt was an oops ( more on that below) :redface:

Then I simply tried trimming the front of the rib, maybe about 1/4 - 1/3 of the length. Like this

DSC01238.jpg


Hurray, the spring does not get caught by the rib and the magwell does not get bulged. Presto, drop free LAR mag with Tactipul. :dancingbanana:

Now for the oops. DO NOT TRIM OFF THE WHOLE RIB. I got a little carried away the first attempt.

If you get rid of the entire rib like this

DSC01240.jpg


You end up with this :(

DSC01241.jpg


Yeah, that's the magazine floor plate separate from the pull ring. Not what I wanted.

I can fix it though. It will look a little bubba but I can live with that. :D
 
Bolivar said:
Yeah, that's the magazine floor plate separate from the pull ring. Not what I wanted.

I can fix it though. It will look a little bubba but I can live with that. :D
Click to expand...

Glob some epoxy on it in place of the rib, and you should be good to go, and it won't look bubba unless you take it off.
 
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