Top Off Mags or Not?

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In another thread it was mentioned the tendency for Smith autos to partially or fully strip off the top round when the magazine is remove to either top it off after chambering a round, or for other reasons. I thought it would be interesting to discuss various opinions of whether or not to top off or just leave it in the gun as is, one round short?

My humble opinion is to leave the magazine after you have chambered a live round in the gun. There are several reasons in my view. By doing so, you can be reasonably certain the gun is in battery with a fully inserted magazine. Whether you pull the slide to the rear and let it go or you have the slide locked and just release it forward, you can be certain the gun is ready upon completion. If you chamber a round, then remove the mag, insert another round then slam it back in (slamming usually required) you have the possibility, remote as it may be, of failing to fully seat the mag.

Another possibility is that the now fully compressed magazine created enough force on the bottom of the slide to, in admittedly unusual circumstances, fail to fully feed the top round. This could occur with a force limp wristed grip in a combat situation or if the slide is lightly bumped when in a prone or barricaded shooting position. Again, while these events are unlikely and only a remote possibility, they are things to consider.

My phobia, if you will, comes from many years of using an AR. No one with any experience every puts 10 rounds in a 10 round mag, 20 rounds in a 20 round mag, etc. Yes, the design and function of an auto pistol is dramatically different than an auto rifle. However, being a somewhat old timer, old habits die hard. I keep all my unloaded pistol magazine full, but rarely top one off after chambering the first round.

I am looking forward to opinions and views on this subject. I expect them to vary considerably and for different reasons.
 
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It depends on the gun. On my M&P40, I top it off and I don't have any problems. On my 6906, it's all I can do to seat a full mag in it if there's one in the chamber so I don't top that one off.
 
With my 6906, there is one chambered and the mag then topped off. That is thirteen rounds to use. I have not had the problem of a round stripping off when removing the mag to top off. Most L.E.O. s I know, top off with one in the tube.

No problem for me.
 
I just watched The Shootist again the other day. when Opie asked the Duke about loading 6 rounds in a Colt in stead of 5, he said, 'do what your guts tells you'.
I've got to say, I go along with the OP. I don't feel I have to worry about that 1 round. I'd just as soon not have the extra compression if I'm just carrying it around. If I'm walking into trouble, I can't see that extra round would do a whole lot either. So a couple of spare mags should take care of things.
 
I routinely load my Glock G-22 from the magazine and then top off the magazine which is then loaded into the pistol. I do the same with my Springfield Mil Spec 1911-A1 as I figure that the round needs to be fed from the magazine into the chamber to avoid damage to the extractor. After being topped off, the magazine is locked into the pistol. Neither pistol presents a problem with inserting a full magazine into the grip. Sincerely. brucev.
 
I carried a 3rd gen S&W 9mm for almost 20 years, I always topped off the mag, as did everyone I worked with, we never had any issues with this practice.
 
Tactically it makes sense to top off. In a fight the last thing you want to do is shoot your gun dry, in practice I count rounds and reload before the slide locks back. One thing to consider doing this is that all spare mags are full and lock in fine. BTW the round stripping issue is no big deal, if your gun does this just reload that round along with another and reseat mag.

m.
 
I always top off mags, but I carry autoloaders only after I've used them a lot. I believe that the original poster's logic is solid, and should be disregarded only after long experience, with each gun and each mag, hinting that his recommendations may be unnecessary.
 
I shoot my 3913 in IDPA where I am required to top off. Never a single malfunction, and that's how I carry it as well.
 
Always topped off and never had a problem. Had a buddy one time that did not top off. He had a problem -- ran out of bullets before he ran out of problem.
 

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