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Article The .45 GAP

By Overkill338, Jan 24, 2017 | | |
  1. Overkill338
    Created by Ernest Durham in 2002, an engineer with Speer at the time. He did so at the request of Glock to create a cartridge with equal power to the .45 ACP, but be stronger in the neck area to lower risk of blow outs there, and also let it fit in the 9x19 & .40 S&W sized handguns. Of course GAP stood for "Glock Auto Pistol". No sooner than this cartridge hit public knowledge we started hearing "it will be gone in 10 years". I laughed just last week as I was in a local gun store and heard the same thing. "the .45 GAP will be obsolete in 10 years" and I couldn't help but reply with "yeah, that's the same thing they said in 2003.

    GT 45 3.jpg

    The .45 GAP operates at the same PSI as the .45 ACP +P pressures and pretty well matches the standard ACP's performance. The Glock 37 holds 10+1, the Glock 38 holds 8+1 (yes same as a 1911 in a smaller lighter package), and the Glock 39 holds 6+1. I personally carried a Glock 39 for several years and never felt under gunned with those 200 grain Gold Dots. Then there is extra comfort in having a Glock 37 mag as your backup. Maybe it was just me but I always found them to be very soft shooters considering they match the ACP +P pressures, and accuracy always came easy as well.

    GT 45.jpg

    The .45 GAP has a lot going for it when you really break it down. Sure , I know you're probably thinking "why do we need another .45 Auto when John Moses gave us the most perfect invention since sliced bread". Now why I do agree, J.M. Browning was a genius far ahead of his time, I do believe he would have liked the .45 GAP and may have been right there with the gunny pushing it. Lets look at this from a perspective recently brought up in a Glock Talk conversation. The .45 GAP is to the .45 ACP what the .40 S&W is to the 10mm Auto. Who's to say if the .45 GAP had hit first, that the .40 S&W might be barely holding its nose above water? You get smaller frame guns that almost any fingers can grip, plus, the GAP isn't as down on power vs the ACP as the .40 is to the 10mm. Had that one butterfly in China had flapped its wings at the right right time, our 1911 grips would be smaller, Glock 37/38/39 would be selling like hot cakes, and us 10mm lovers wouldn't have that horrible .40 Short & Weak bothering us.

    GT 45 2.jpg
    There are many LEA's carrying the .45 GAP, but I cant seem to find a master list. I think the Alaska St Troopers do, as do the city police in Mt Airy, NC, I think GA is on that list as well.

    I do recommend you give one a try at least once. If you can carry a Glock 19/23/32, then you can carry a G38 just as easy. The slide of the GAP's is a little wider 1.18" and loaded a G38 weighs 31.95oz, try that with a 1911! Lets face it, as gun enthusiasts, we hate to see any gun disappear, or go into expensive collector only status. Go out, find someone who still rents them, or watch GunBroker for deals. I got my OD Green G39 for $380, and found it well worth it.

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Recent User Reviews

  1. BlueStateSaint
    "Good and informative"
    I know that the New York State Police have used them for a decade or so. The one shooting that I know of using the .45 GAP was last spring, where the firearms instructor for Troop B in Ray Brook (west of Lake Placid) hit an escaped felon with two rounds. The first one was a 50-yard, quartering away shot; the second was at 55 yards, as the felon was falling to the ground.

    Good article on the backstory of the .45 GAP.
  2. AgentM79
    "45GAP; still a good idea!"
    This article gives a brief summary of the virtues of the .45GAP cartridge. I like the round in my G39, but see the round's future as uncertain. If Glock makes the guns that fire GAP fit 9mm holsters, it will likely see increased LE use. If they ever make their 45ACP guns fit those same holsters, though, I think GAP will be an enthusiast's round only.
  3. Sherlock Glock
    "The Great 45 GAP"
    Super artical. I bought the first G37 that came in the DFW area. I also bought 2,000 rounds of ammo. When I worked the GSSF, I always ask only for the 45 GAP brass. I now have over 7,000 rounds of brass. I have many good loads that shoot very accurate. I have short fingers and the standard frame fits fine. I have both the G37 & G38. Had the G39 but traded it


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  1. AZ_Wildcat
    I bought a Glock 37 when they came out, then rounded out the set with a 38 and a 39. I really like the GAP. I don't carry it often though. My department was a Glock 22 organization, so I just carried that, and still do more out of habit than anything else.

    BUT...over the years as a competitive shooter, I have used the GAP in a bunch of IDPA matches and in more than a few specialty BUG matches. I have dies for my Dillon and a few thousand pieces of brass, so inexpensive practice and match ammo is not an issue.

    I think it's a great round.
      Poohgyrr likes this.
  2. Dave Earnest
    What I can't understand is why this round didn't supplant the .40 Short&Weak? I prefer the 10mm for outright power. The .45ACP is a design from before computer design and ballistic simulation software. Inefficient but still VERY effective. The .45 GAP is what the .45ACP could have become if anyone wanted to improve it.
  3. Deployment Solu
    I invested heavily in 45GAP about 7 years ago. Local gunshop had ordered on thousands of 45GAP ammo(Speer Lawman 185 gr flat point) for one of the local PDs. That wasn't what they wanted. I got 8k rds cheap. Had a GT member selling 6K of once fired nickel brass cheap. I bought that too...even came with a case gauge!! I have had 4 or 5 45GAP Glocks and even one Springfield XD...I carry the G30 EDC, but the custom G38 is my dress up carry when I need something a little thinner and lighter under a sport coat....It is a sweet shooting caliber with excellent ballistics!!!
  4. 12guage
    I like the 45 gap idea.. I would love to have one.. but I never see the gap ammo on local shelves. You can walk into my local sporting goods and find 10mm, and 357sig, but no gap.. that's a no go for me..
  5. Shaquanda
    baah humbug long live the 9mm
  6. BigMick
    I'm going to try to pick one up as soon as I finish spending money on a couple other projects. I have always been curious about the gap and it seems like a good idea. The only problem I foresee with it is ammo availability and cost.
  7. Joseph Senko
    I own one that has the chrome slide, SS barrel and a SS Guide Rod. I added night sights. Used this as my duty pistol when I did high risk security in the streets of Charlotte. Easy to carry, two extra mags. It is accurate to a fault because of the barrel is match target. The carry ammo is from Mag Tech 230 gr. 1100 fps. and about 545 ft. lbs. That is hard hitting. It a +P+ and the 37 digest this all day. Love this firearm.
      bmrtoyo likes this.
  8. ssgrock3
    I got a 37 also and would love a deal on a 38. At least an article about the Gap.
  9. bmrtoyo
    i must be odd ,,ive got a 37 ,and i like the gun and the round .soft shooting and it packs a punch ,and the gun is just accurate , ive got it on the nightstand on bump in the night duty ,loaded with federal 185 gr hydra-shock's ,, 1090 fps and 490 ft pounds ,, i always like the underdogs they say the 10 mm is going belly up and im never parting with my glock 20 either .
      StLJohn likes this.
    1. Overkill338
      The 10mm is going right the opposite. Back to the top, to shut up all the "45 Acp" is king crowd. Underwoods 200gr 45 Acp +P from a 5" barrel gets 1100fps. My Glock 29 averaged around 1140 fps with Underwood 200gr bullets and that's from a 3.78" barrel.
    2. bmrtoyo
      yes i think the 29 sf is next on the list along with a 30 sf lol decisions decisions .
  10. ca survivor
    I understand that the FHP is not too happy with their GAPs
      GVFlyer likes this.