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PistolGear 170mm Mag Extension for XDm (Grams)

PistolGear 170mm Mag Extension for XDm (Grams)
Price: $55.99

Based on 13 ratings. (View)

Are you looking to add some extra rounds to your magazine, whether for competition or practice? If so, this may be the product for you. Made of aluminum and with a removal backplate, this rugged design allows you to install your new spring, follower and extension in a minute or less. Unlike other magazine extension on the market, you will not need to fight with this one and it will NEVER come off of your mag tube during a reload.

When this extension is added to your XDm magazine tube, it will bring your OAL to 170mm, making it legal for USPSA Open Division.

All PistolGear magazine extensions are paired with Grams Engineering Spring and Follower.

When used with compact (short) frame models, the magazine will require the x-tension sleeve.


  • 9x19 = 28+1 (+9 rounds)
  • 40S&W = 25+1 (+9 rounds)

Kit includes magazine extension, rear plate, four screws, spring, follower.

5/64" HEX Key is included. This part will NOT fit XDm45 ACP Magazines.

Note: Because of the design of the follower, for the benefit of maximum capacity, your gun will NOT go to slide-lock when empty.

WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to - www.P65Warnings.ca.gov

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13 Product Reviews - Average rating 4.5 / 5 (Show All)

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- 08th May 2018

Installation was simple and fit and finish was very good. It worked well on initial testing but failed in the middle of a match, and twice in post competition testing. The spring doesn't appear to have enough tension and it sticks down. pretty disappointed and hoping to return.[PG NOTE: Sorry for the trouble. Failures during a match are quite painful. Assuming that the part was assembled correctly, make sure that the inside of your mag tube is clean and without any grit, or the there is no burr on the inside that the Grams follower can catch on. There is quite a bit of tension in the spring so lift should not be an issue. When this happened to others in the past, the spring was installed backwards or the inside of the magazine was dirty. Hopefully these suggestions resolve the issues you are seeing.]

170mm Mag Ext. XDm (GRAMS)

- 24th July 2014

Simple to the point website with very easy ordering. The 170mm Mag Ext w/GRAMS spring and follower appears to be very high quality. Quick delivery. It installed in just a matter of minutes.
I'm eager to hit the range and try it out.
Kind of don't like that the ammo stacks oppisite of the factory mag and the follower looks kind of crooked when it's empty. It works well though. I've loaded and unloaded it a few times now, just have shot with it yet.
I know that it extends cappacity from 19+1 to 28+1 but visually my OCD is kicking in and wondering if I could swap out the followers to use the factory follower? This way it would sit in and look correct.
Overall I rate it a 4 and 3/4 but the button wouldn't let me He He!

Awesome Extension

- 04th November 2013

Got this for my XDm for HD, I don't shoot competitively. That said, I chose the Grams kit for capacity and no, I will not take off a star because it does not lock back. If you want to retain the slide lock function purchase the 'Stock' kit with a capacity tradeoff and don't penalize this model for what is clearly stated. A function test with live ammo out back showed this mag flawless. It is well made, nicely machined and does not require modification to the mag tube. The black anodizing and lines perfectly compliment those of the XDm. I could not be more pleased, excellent job PG.


- 14th October 2013

Have 2 and would love to have 5 more. Awesome product and adds to the look of your xdm.


- 12th April 2013

Installed in less than 5 minutes, functions exactly as advertised. Im very pleased with the extra capacity!


- 12th April 2013

First off understand this is meant primarily for gun games, so its understandable that there is no lock back after the last rd. Installation was easy, and did not have to worry about the spring binding and popping out of the base pad. I know it says 28+1, but for me I was able to get 29+1!!! I had not problem loading it with my bare hands! That's one thing I had a problem with Arrendos(sp) 140mm extensions, when I got to rd 19 its was difficult to load the last 3 rds. I got to 28 easily, and cheating, used the XD gear mag loader for my XDm mag. Also fully loaded at 29rds, the mag with the 170mm extention worked well with the Pistol gear unlimited magwell, I did not have to slam the mag really hard just to get it to seat . Overall this is a great mag for gun games and I'd grab another one as a backup. Waiting for them is worth the wait. Thanks Pistol Gear!!!

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