Building Open Glock

[jimbullet]

Im building an open glock using a g17 and have most of the parts installed already. Comp has 2 ports at the top and one on each side, similar to the carver comps.I thought I describe it if it is of any help.

I am wanting to build up a load for speed/ steel challenge matches and wanting to start out with factory ammo running power factor of 125-126 thereabouts.

My question is, what spring weight would be recommended. The gun jams on 17 lb and on 15 lb.

Has anyone tried the zev 12 lb springs if they work? I would have preferred the ISMI 11 lb springs which were recommended but they simply are hard to get by in New Zealand. Whats so far available is the 12 lb and 14 lb ZEV recoil springs and so I just thought if anyone had experience if they worked on your glock open pistols.

[Stev7783]

Most major glock builders (carver, sjc and zev) recommend 11-9 lbs springs running that low of a power factor simply for the fact of you'll jam using springs with more weight then that.

[kylet]

You will probably have much better luck with the 12

[JackinSD]

I know mine, with a similiar setup, will not run factory loads with a 11lb spring. I don't have to run major but I do run 150+pf for the comp to do a little work. Comp works alot better with loads going at least major. Major I run a 13lb spring.

Edited December 22, 2013 by JackinSD

[Stev7783]

I know mine, with a similiar setup, will not run factory loads with a 11lb spring. I don't have to run major but I do run 150+pf for the comp to do a little work. Comp works alot better with loads going at least major. Major I run a 13lb spring.

Have you ran major with an 11 lb spring in your setup? What comp are you running?

[jimbullet]

What manufacturers do 11 lbs or even lighter (i.e. 8,9 lbs) apart from ISMI? So is it not possible to run factory 9mm loads with a comp?

[jimbullet]

Ive only tried so far a 15 lb spring and it slightly moves the slide back causing almost like a stove pipe jam

[JackinSD]

Stev7783, I have run the 11lb spring with major. I could not feel or see a difference between it and the 13lb. I am running the Jager Comp.

http://jagerproducts.com/index.php?main_page=product_info&cPath=1&products_id=1

[JackinSD]

What manufacturers do 11 lbs or even lighter (i.e. 8,9 lbs) apart from ISMI? So is it not possible to run factory 9mm loads with a comp?

You can get at least down to 10lb from http://www.gunsprings.com/index.cfm?page=items&cID=1&mID=5#109.

[G17]

With factory ammo Zev's blue 12 lb should work.

[Henry625]

I use a 10 lb. round coil spring with minor and major loads. Gun works flawless, minor loads kicks the brass out about two feet from the pistol and major kicks out slightly farther.

I was told to try a lighter spring to flatten it out even more, but I thought if I went too light, the slide would not have enough energy coming forward to strip the next round out of the magazine. Besides, I haven't found anything lighter than a 10 pound spring.

I have a Carver "major P/F" comp on mine,....I mainly shoot 148 P/F loads, that is the most accurate out my pistol, full house major loads start opening up the group size substantially.

Edited December 22, 2013 by Henry625

[Stev7783]

What manufacturers do 11 lbs or even lighter (i.e. 8,9 lbs) apart from ISMI? So is it not possible to run factory 9mm loads with a comp?

You can run factory loads but the amount of gases produced by the load isn't enough to make the comp work properly.

Edited December 23, 2013 by Stev7783

[jimbullet]

What manufacturers do 11 lbs or even lighter (i.e. 8,9 lbs) apart from ISMI? So is it not possible to run factory 9mm loads with a comp?

You can run factory loads but the amount of gases produced by the load isn't enough to make the comp work properly.

I suppose in order to maximize potential of having a comp, it does require a major pf load but even running say low pf such as factory loads, the comp will still do what it is designed to do isnt it, and that would be to expel gases upward and through the ports, so it would still help reduce recoil.

[JackinSD]

What manufacturers do 11 lbs or even lighter (i.e. 8,9 lbs) apart from ISMI? So is it not possible to run factory 9mm loads with a comp?

You can run factory loads but the amount of gases produced by the load isn't enough to make the comp work properly.

I suppose in order to maximize potential of having a comp, it does require a major pf load but even running say low pf such as factory loads, the comp will still do what it is designed to do isnt it, and that would be to expel gases upward and through the ports, so it would still help reduce recoil.

The less gas the less muzzle flip reduction, not less recoil.

While it is true that there is still gas being redirected, once you hit a certain point in gas reduction the difference in a comped and non-comped pistol becomes difficult to distinguish.

[EkuJustice]

A fast light bullet with a lot of slow powder can still work the comp at minor. For steel minor loads with a comp 115 is good 95 grain is better. Don't always shoot for 125 -130 either as you may bet better results at like 140 or so

[fdc1999]

I am using factory 115 rounds through my M&P 9 with a carver 3port comp. It may not be efficient, but the comp is definitely working with the factory loads and making a difference. I am also playing with springs to get it just right. The wolff 12 is a tad too light, the 14 a bit too heavy. The M&P uses the same springs as the G17.

I am now looking at trying an ISMI 13lb spring. If someone has one for trade, I have Wolff-Glock 10 and 11 lb springs I would trade both for the ismi 13lb. The 11 is new in the bag, the 10 has maybe 20 rounds on it.

Which comp do you have with 2 ports? That may be perfect for factory loads. I just dont have the time for reloading this year.

Edited December 25, 2013 by fdc1999

[Kraj]

I use a 10 pound spring for minor loads

[kamann]

Delete.

Edited December 25, 2013 by kamann

[jimbullet]

[jimbullet]

The project (pic above) so far with 2 main ports then one smaller port and one on each side

[Henry625]

so, the comp is not commercially available?

[kamann]

Delete.

I used to use a 10lb Govt. Model spring for minor.

[shooter995]

I have probably all the info you want, I built one and shot it the end of last year. It worked really well, beat a few well known shooters with it. PM me if interested.

[jimbullet]

so, the comp is not commercially available?

No but it is close to a carver comp but the last comp has a smaller chamber with multiple smaller ports.

I had it made to order.

Edited December 28, 2013 by jimbullet

[jimbullet]

For those using the zev springs, I just got mine in....confused now - one end has a coil smaller and the other end is larger. So, which one goes near the muzzle and which is at the rear?