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Old 05-09-2020, 10:21 AM
Beastcatguy Beastcatguy is online now
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Join Date: May 2020
Posts: 4
170mm mags vs shorties

Im moving to open from Carry optic and I need a few mags. Is there any reason besides weight that I should buy shorter ones? Does anyone use different mags for classifiers? I had enough mags for the glock to run the entire match without reloading but MBX mags are a little more expensive. Im running a Limcat with a PT Evo grip.
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Old 05-09-2020, 12:27 PM
Tom Freeman's Avatar
Tom Freeman Tom Freeman is offline
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Join Date: Jan 2001
Location: Colorado
Posts: 7,521
If it will save you a reload or trying to figure out where to do a reload, they are awesome.

They can be finicky when you try to cram in 29-30 rounds. Roll sized brass makes things easier.

Short mags are a little easier/faster for me to reload with. And I dont like dropping my 170s on the ground if I dont have to.
I am a rather brilliant surgeon, perhaps I can help you with that humpů
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Old 05-09-2020, 03:01 PM
pat_jones pat_jones is offline
Join Date: Nov 2016
Location: Colorado
Posts: 170
I don't shoot open, but the 155 mags seem a nice compromise for open when you don't need a big stick.

Pat Jones
Firestone CO
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Old 05-10-2020, 06:20 AM
Rwehavinfunyet Rwehavinfunyet is offline
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Join Date: Mar 2014
Location: Florida
Posts: 7,944
STI 170mm mags....

I have and use three STI 170mm mags in the USPSA Open division using 9mm Major loads. I use the STI standard base pads, but replaced the standard polymer mag follower with "Gram" followers, and can load 29 rounds in the mag.

In USPSA, I believe any stage design should only need 32 rounds or less to get all the required hits.....more if the shooter has a lot of total misses...!

If I have a stage design that requires 26-27 shots, I will start with a 170mm mag, and carry a spare 170mm mag. If I have a stage design with 32 required shots, my 170mm mags with the Gram follower holds 29+1 rounds of 9mm Major ammo, so I will be forced to conduct a reload during the COF. If I have to make a reload, I may use three 140mm mags with deep base pads, that allow 21 rounds of 9mm Major ammo. I start with one 140mm mag, and have two spare 140 mm mags in my double mag pouch..... If it is an unusual stage design with a high round count, I will decide where I want to conduct a reload, and determine the best magazines to use.....

I also use my STI 2011 Open race gun for shooting Action Steel matches at my local range. There is no rule on magazine length, so I cut down an old STI 2011 mag roughly three inches from the base of the tube and welded the extra three inch tube to a STI 2011 170mm mag. The welds are below the bottom of the grip/frame, so it does not interfere when inserting the mag in the gun. This unique magazine, with a deep base pad holds 35+1 rounds. If I feel the number of rounds and the stage design warrants the long extended 35 round mag, I will use it. Not having to reload may save a second or a second and a half.....so I have an option!

Last edited by Rwehavinfunyet; 05-10-2020 at 06:34 AM.
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Old 05-12-2020, 10:32 AM
waktasz waktasz is offline
Join Date: Jul 2003
Location: SE PA
Posts: 1,631
Shorter ones are a little easier to reload on the clock, especially important for classifiers. Some people don't like to drop their big ones either because they are expensive and require tuning, so they base their stage plans around that.
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