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Anyone know if any manufacture is offering stiffer springs for the Gen 4 guns? All I am finding is gen 3 springs and the adapter plug and gen 4 stainless steel and tungsten but they are all factory spring weight
 

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Anyone know if any manufacture is offering stiffer springs for the Gen 4 guns? All I am finding is gen 3 springs and the adapter plug and gen 4 stainless steel and tungsten but they are all factory spring weight
When you say stiff springs, what is your end goal?

There are the following springs that you might swap out where the "weight" would make a difference to trigger pull:

- Trigger spring
- Striker spring
- Firing pin safety spring

With the trigger spring most after market springs are design to give the trigger a lighter pull.

Glock does have the NY Trigger springs which are heavier than the standard 6lb spring. Using these you can increase the standard 5.5 lbs pull to 8 or 12 lbs.

If you want a lighter trigger pull there are plenty of reduced weight springs on the market designed to do that.
 

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i too recently bought a gen4 g21 and last/1st time at my range the slide was having "occasional" trouble going into full battery.would stop less than a 1/4 inch.i was using federal factory loads.i'd heel bump it and it would lock up but i'm thinking it's my 2pc spring causing the problem.i bought the 1pc and the plug adaptor but haven't had time to put them together and install it yet.hoping it solves my problem.bought the gen4 cause my wife "claimed" my gen3 g21 cause she liked it better than a sr40-full size- i bought her.
 

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My mistake I was talking about recoil spring and complete guide rod assembly's
Right, it is definitely easier to get new springs for a Gen 3 gun. With the Gen 4 gun there are some conversion units that allow you to use Gen 3 springs (ex http://glockstore.com/pgroup_descrip/7/7895_GEN4+Recoil+Assembly+Adapter+Ring/) OR you could look at something a full assembly in Tungsten (http://glockstore.com/pgroup_descrip/426_Gen+4+Specific+Parts/8075_Gen+4+Tungsten+Guide+Rod/) or Steel (http://glockstore.com/pgroup_descrip/426/8017_Gen+4+Stainless+Steel+Guide+Rod/). I believe the actual spring weight is the same as the factory spring weight though.
 
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