Thanks! Have an AIWB, ACS, for a TLR7 on order. Also ordered it with the red dot cut and sup sights. A little wishful thinking here, hoping the BUS sight solution will be coming soon.
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What is the weight of a standard PX4 hammer spring? I am trying to decide what weight hammer spring to get for my PX4, but I would like to know the spring I buy in relation to the factory standard spring.
I think the factory spring is 16 lbs. My experience is that a 12 lb. spring will fire anything including Winchester NATO-spec ammo and handloads with rifle primers, and the lighter springs work with commercial ammo and handloads with pistol primers. I haven't tried steel case ammo. The Beretta PX4 D spring is somewhat heavier than the 12 lb. spring.
Note that recommendations for the 92 series are different than the PX4, they're different guns.
I have been trying to piece together an idea of the spring weights. @LangdonTactical has 10# and 11# springs for the PX4. LTT also says the PX4 D spring is too light for use in the 92. In a video on 92 springs, Ernest suggests the 92 gets dicey below 13#, which leads me to believe the PX4 D spring may be in the 12# to 13# range. Ernest also says the standard 92 spring is/was 20# and the 92 D spring is 16#. Then Ernest warns that the 92 D spring is heavier than the standard PX4 spring. That suggests that the standard PX4 spring is somewhere in the 13# to 15# range.
At any rate, if anyone knows the weights of the PX4 standard and D springs, I would appreciate that info.
Your information is good, but there is a "translation metrix" missing, so to speak. The problem with the cross reference is that the m-92 springs are 3 coils longer. So, in a PX4 the stock spring produces a 20# yield and the PX4 D spring ~16#. However, the 10#, 11#, 12#, 13# spring designations are m-92 springs.
Since a D spring from a model 92 is 3 coils longer it will be stiffer in a PX4, too stiff. Yet a D spring from a PX4 would be too weak in an m-92 (3 coils too short).
I have found that a 12# m-92 spring in a PX4 will produce the same trigger pulls as a PX4 (actually Cougar) D spring.
In a model 92 that same 12# spring would be right on the borderline of reliability (depending upon ammo and firing pin channel maintenance), yet in a PX4 it is strong enough that many use the 11# spring.
Regarding replacement recoil spring assemblies for the PX4 compact, I see some sites list separate parts for 9mm and .40SW, but other sites list the same (single) part as applicable to both 9mm and .40SW. Did Beretta eliminate the two separate parts in favor of one common part?
The PX4 Compact (and full size) use a different slide rebound spring (guide rod assembly) for 9mm and .40. Only the PX4 SubCompact has a progressive spring that is shared for both calibers.
So, the PX4 Compact needs a different spring for .40. https://www.midwestgunworks.com/page/mgwi/prod/c8a652
9mm https://www.berettausa.com/en-us/px4...tions/c8a644w/
I had thought the same, but MGW shows the 9mm compact recoil assembly as discontinued:
https://www.midwestgunworks.com/page/mgwi/prod/c8a644
Brownells doesn't carry it anymore (whereas they once did), but they still carry the .40SW version.
Maybe it's just supply shortages.
https://www.berettausa.com/en-us/px4...tions/c8a644w/ I edited the previous comment too slowly...