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Glock 20sf 10mm to 40sw

9.4K views 92 replies 22 participants last post by  PTAGP100  
#1 ·
Recently purchased a Glock 20sf, never shot a semi auto before. In fact this is my second and final gun purchase. My first is my Ruger GP100357. I am wanting to purchase a conversion barrel to shoot the cheaper 40sw, is this a drop in process or do i have to modify or alter anything in my gun? I will be trying this gun out in the range this monday with Magtech 180 grain 10mm, got it for $17.99 at Sportmanswarehouse in Milpitas CA. Thanks for the future respones.
 
#6 ·
Drop in. This is a great approach for the budget-minded. Unless you reload, 10mm ammo is pricy. :eek:
 
#7 ·
Optics planet had storm lake conversion barrels at a good price. It is drop in and go. Think they were $130.00. Price difference in ammo is about $5 on a box of 50 so just do the math to see how much you will need to shoot to pay for the barrel
 
#13 · (Edited)
I guess the other potential upside is Ammo availability. I haven't owned a .40 in some time. Not against them at all, just hasn't come my way again but.. when the greatest gun salesman ever sent ammo hording into the stratosphere I had a .40 and I was still able to get .40 on the shelves which for the most part looked barren.

Since then I have taken up reloading so its not that big an issue but if someone doesnt reload, having another barrel might keep that gun from being a paper weight and buying a $130 barrel is cheaper than buying another gun.

Good luck and please post a range report!!
 
#15 ·
Thanks Aboriqua!! Im actually new to semi autos my only experience is my Basic training back in 2001 M16 and 6 trips to the range with my GP 100. So far i have just taken up Youtube vids on taking the Glock 20sf apart, loading and unloading SAFETY and remedying a type 3 malfunction (double feed, i think). I have been using dummy ammos for this ofcourse. Do you know if the Glock magazine loader for 10mm would fit the 40sw?
 
#18 ·
Congratulations on the G20, it's a very easy gun to shoot well with stout 10. The mag loader that Glock provides will work fine, as all it dose is make compressing the spring a little easier buy pushing down on the previous cartridge with the loader instead of your thumb. However I'm more curious about how well the 1/8+" shorter cartridge will feed.
 
#20 ·
While I wouldn't do it, I did see a fair amount of youtube vids of guys shooting .40 with a straight up glock 10mm tube and mag. There would be a ton of extra head space but .. it should work.

Personally though .. I would go with the conversion barrel.
 
#26 ·
I just got my G-20 a few months ago and for many reasons have not shot it yet, I did buy a 40 conversion barrel for my G-29. I have not shot the G-29 since then, but the barrel is in it ready to go. Really simple. I bought a Lone Wolf, but all seem good.
 
#27 ·
It's always nice being able to shoot multiple calibers from the same pistol...saves on costs and allows for a variety to choices!

With a Glock...there's nothing else you have to do except drop the barrel-in...although if you wanted to, you could always get an 18# recoil spring from Lone Wolf Distributors...that'll just serve to help things run a little smoother.
 
#30 ·
Thanks for the replies Panda, Amish, Ditto and Jeremy (btw i understood what your account name means in Filipino, lol). I opted to go for the conversion barrel, $129.00 spent would not hurt. I will keep you guys posted on my first time shooting this gun tomorrow with the stock barrel and 10mm ammo. Have a good night.
 
#32 ·
Right handed? Looks like you are pulling everything to the right a little bit. Crossing over from a double action revolver to a "safe action" semi auto can be tough. Focus on your fundamentals,grip, sight picture, and trigger pull and you will be fine.
 
#33 ·
Right and low is where most inexperienced people hit with a semi auto pistol. Just takes some practice and attention to proper shooting techniques. :)
 
#36 ·
7 yards only, im really embarrased. I thought i would do better because i came in with the mentality that the double action trigger is harder to perform than the one in the Glock. But i think i lost the ability to predict when the gun is going to fire (i like staging the trigger). I also got overwhelmed with the recoil, i thought the 357 magnum recoil would be more if not alike. I just ordered a .40sw g sight laser training cartridge to practice with. Thats how i practiced dry fires with my GP100. Hopefully theres a carryover. Thanks again Aboriqua!
 
#38 ·
I would not advise shooting .40 out of a 10mm barrel, but if someone wants to have faith that the extractor will provide proper head space, they can go for it.
10mm, .40 and most other pistol cartridges are head spaced on the case mouth, using a case that's way short for the chamber isn't a good idea.
The guy in the truthaboutguns article also thinks that kabooms are the result of excessive headspace. You'd have to have quite excessive head space for that.
Kabooms are the result of bullet set back, which raises pressures.
When the bullet is seated deeper during chambering, pressure skyrockets and kabooms happen.
Since almost all .40 loads are already running full tilt, kabooms seem to happen more with the .40.
I don't keep re-chambering the same round after unloading, that round gets shot ASAP.
 
#39 ·
I am with you on using a bbl matched to the round but I should point out .. alot of the Kabooms that happened with glock 40's was a result of the earlier design having really awful chamber support. I have pictures where almost half the brass was showing at the ramp. It created a horrible bulge and reloaded ammo would blow up.

I am not a glock fan boy and resisted them for years and only bought my first one about a year ago but .. they have improved the design so that there is more support. Having said that .. the stock 10mm bbl is still a loose sloppy fit.

If the OP bought a Stormlake .40 BBl the chamber support is EXCELLENT!
 
#40 ·
The Glock trigger is an acquired taste to be sure, lots of dry fire will help you get accustomed to the rather odd feel. The 10mm (and the 40) have a very sharp muzzle whip effect to their recoil, which is distinctly different than what you are used to with 38s or 357 from your GP100. The comparatively light weight of the Glock doesn't dampen that effect very much either. My first 40 cal was a Beretta 96D Centurion that I looovvved the feel of, until I shot it. I have fired tens of thousands of full house 357 through all manner of revolvers and I simply couldn't deal with that Beretta, damn near gave me carpal tunnel syndrome.
 
#43 ·
Justin I will do alot of dry fire training. I ordered a G Sight laser training cartridge. This is how i practiced with my GP 100. I could not afford to go to the range often. My quota/ or ration is $60 worth(3 range visit Max) of ammos per year. Everytime i shoot i feel like im taking away from my daughters' college funds.
 
#45 ·
Well Murphy's law strikes today. Yesterday i left a note inside my mailbox that if my box is full please leave my package inside my patio not outside the door of my apartment for my fear of theft. Well guess what my mail carrier not only delivered my package in the wrong adress they left it on the front porch as stated in my ebay tracking. Now i have to find time to make a complaint at my local post office so they can find out where this mail carrier delivered my Stormlake barrel. I hope one of my neighbors got this package and is honest enought to give it to me and hopefully did not open the package as i dont want anyone to know what i own inside my apartment.
 
#46 ·
I have a similar horror story. I live in a mobile home park for old folks. Its a retirement community that is some 50% empty during the warm months. I ordered some $100 worth of stuff from a Supplement company and got the delivered message. I looked everywhere and no package. They said sorry and mailed out the order again. One evening the wife and I are taking our daily walk and I notice a lonely box sitting 10 houses down on the porch of a house I know are winter residents ... I figure .. oh what the hell .. Yup .. my package was sitting there for some 2 weeks.

Back to guns .. while you are practicing there is one other thing you should consider if you are not already doing it. Get your hand CRAMMED up under the short beaver tail. It should feel like its locked in under that as high as you can get your hand where the slide wont make contact with your hand during firing. When I shoot my glock the web of my hand is maybe 5mm below the slide. This will greatly reduce muzzle flip and perceived recoil.

The higher you get your hand the more the recoil comes straight back into you and feels more like a strong push than a snap. Hard to explain.

Well off to the range to play with my 10mm and my 2 Gp100's :D
 
#47 · (Edited)
Alright .. a mini range report and a recommendation. I was HATING the glock 20 trigger and it was killing my accuracy. So I bought a NY1 trigger spring and a Lone wolf Connector.

It was better but reports of it feeling like a double action revolver are GREATLY exaggerated.

After my last visit I decided to remove the NY1 trigger spring, reinstall the stock spring but run the lone wolf connector. Very happy with this set up.

I know you said you were on a strict budget and I truly respect that but the part is between $10-$15 and really made a huge difference for me. I am not ready to be a shooting super star but it brought my groups down.

Here is 6 rounds at 10 yds. That target is on a sheet of 5 targets so the red dot is about the size of a quarter.
http://www.boriqualeather.com/stuff/Glock20 target 1.jpg


There are some ugly flyers here but this is 30 rds at 25 yds with the glock 20
http://www.boriqualeather.com/stuff/Glock20 target 2.jpg

Still ... I like my Gp100. The number 5 was shot at 7 yds and that is 48 rds with my 3"gp100
http://www.boriqualeather.com/stuff/Ruger target/Rug Tar 3.jpg
 
#48 ·
USPS had a huge mistake, i got my barrel now.
Sir I will follow your tips to the tee. Im really passionate about getting better with the Glock 20, i might have to skip the trigger mod for now I am not mechanically inclined.
Those are awesomme accuracy Sir!!! I wish i could come close to that. Marksmanship has always been my first love i think. The BRM in basic training was my favorite. GOD Bless!!