Glock 34 recoil spring change [Archive] - Glock Talk

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rcs9250
10-28-2012, 21:12
I have a G34 that I use to shoot production class in USPSA.
I reload for economy. We load to qualify to a certain power factor. I have an occasional misfeed or failure to eject or a round that just barely ejects.

I was told that I can change the recoil spring to a lighter one that is geared to lower power reloads. Does anyone know what spring rate I should buy and some sources.
Thanks,
Randy

bryandover
10-28-2012, 21:46
13-14 pound is pretty poplar.

SARDG
10-28-2012, 21:54
I don't have your spring answer, but shoot my (stock) G34, G17 (Gen3 & 4), and G26 (Gen4) in IDPA with my reloads that barely exceed PF (~129.5 from the G17) and have no problems whatsoever with cycling on any of them. My brass pretty much dribbles out of the ejection port, about 1 - 1.5 feet to the right, in a nice neat pile (if I'm not moving).

I'd investigate your load further.

rcs9250
10-29-2012, 04:02
Thanks guys.

BuckyP
10-29-2012, 05:15
I'll offer two options:

1. If you are going to stick to the factory, or a polymer guide rod, use an ISMI 13 pound flat wound spring.

2. Get a Wolf steel guide rod and use a 12 or 14 pound "traditional" spring.

I have both, but have only been using option 1. The reason for that is, this particular setup is also legal for IDPA SSP division. It is a cheaper option, since you don't have to buy a guide rod.

I run a 147g bullet right at 130 power factor, fyi.

HK Dan
10-29-2012, 05:47
I used an 11 pounder in my G35 without issues. Better to stiffen up your load though. I now shoot at SAAMI max for every cartridge and I love it. My shooting has improved too!

rcs9250
10-29-2012, 05:47
Mine is a Gen 4. Does that matter with the options you suggested ?
Randy

SARDG
10-29-2012, 06:31
I run a 147g bullet right at 130 power factor, fyi.
...and thta's what I am running as well.

I used an 11 pounder in my G35 without issues. Better to stiffen up your load though. I now shoot at SAAMI max for every cartridge and I love it. My shooting has improved too!
Competitors are generally looking for those powder puff loads that offer less felt recoil for quicker follow-up shots.

Though I shoot IDPA that requires a PF and have some latitude in modification, my same guns have to remain completely stock for GSSF and can do that with the right load.

rjstubbl
10-29-2012, 07:35
With the Gen 4, I would run this setup:

ZEV Tech Gen 4 Reducing Ring:

http://www.glockworx.com/Detail.aspx?PROD=156838&CAT=3694

ISMI Recoil Spring, 13 lb.:

http://www.glockworx.com/Detail.aspx?PROD=156429&CAT=3697

ZEV Tech Stainless Steel Guiderod:

http://www.glockworx.com/Detail.aspx?PROD=156463&CAT=3694

I actually use the glockworx extended guiderod, but I don't see it on their website now. Midwayusa has it though.

sciolist
10-29-2012, 09:06
For Production, #14 Wolff spring and uncaptured rod. Buy directly from Wolff, or here: http://www.cpwsa.com/Glock%20Parts.htm (http://www.cpwsa.com/Glock%20Parts.htm)

You are correct that a lighter spring will cycle better with ~130PF loads. On the other end of things, too little spring increases likelihood of failure to go into battery if there's crud on the round or in the chamber.

The gun should feel reasonably flat, and the sights should return well on splits. You can get a sense of the relationship between muzzle dive and your grip in dry fire by putting sights on target with slide locked back, releasing slide with gun on target, and seeing how well sights return. Try that with #17, #14 and #11. It's partly a function of how you grip the gun, so not the same for everyone.

The heavier rod gives you a little more mass up front. You could probably also get away with a Jager extended steel rod and still make weight for Production: http://jagerproducts.com/index.php?main_page=product_info&cPath=35&products_id=95&zenid=9a5tt0ru63aa4ejgra7o99nue2 (http://jagerproducts.com/index.php?main_page=product_info&cPath=35&products_id=95&zenid=9a5tt0ru63aa4ejgra7o99nue2)

BuckyP
10-29-2012, 09:35
Mine is a Gen 4. Does that matter with the options you suggested ?
Randy

Hmm, didn't consider that. I have no experience with GEN4s yet.