9mm springs

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9mm springs

Post by Larry2520 on Fri Jun 16, 2017 10:02 am

Does anyone have any insight as to what combination of main and recoil spring weights would be best for a 9mm with a slide mounted optic?

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Re: 9mm springs

Post by Jon Eulette on Fri Jun 16, 2017 10:29 am

BE pistols vary for spring weight. Why? Is it loose fitting barrel or hard match fit. Lockup/unlock timing has a result on recoil (slide velocity). Match pistols I build are running 10# springs for either irons or optics. I fit barrel to function for sights/optics being used. So I recommend you try an assortment of springs. 
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Re: 9mm springs

Post by Larry2520 on Fri Jun 16, 2017 11:56 am

It's a hard fit match barrel. I put some springs I had in my parts bin. Unfortunately I don't know their strength. I think the recoil is a 10 pound but I have no inkling the strength of the main. I had some soft hits at the range. The only other mains I have are 20 and 21 pound mainsprings. Once in a while it stovepipes so I ordered an 8 and 9 pound recoils. I'll try the 21 pound main and one of them and see what happens.

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Re: 9mm springs

Post by STEVE SAMELAK on Fri Jun 16, 2017 12:16 pm

If your not sure what you have to start with how can you choose a path to correct the problem?
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Re: 9mm springs

Post by Jon Eulette on Fri Jun 16, 2017 12:55 pm

Got to be careful going below 10# on recoil spring. You start losing lockup time in battery and groups will grow at 50yds.
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Re: 9mm springs

Post by Jon Eulette on Fri Jun 16, 2017 12:59 pm

Stovepipes are probably extractor related.
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Re: 9mm springs

Post by zanemoseley on Fri Jun 16, 2017 2:18 pm

On my old Les Baer .45 I fought stove pipes since day one. Before I knew better I was convinced it was the fault of too weak of a recoil spring. One day I finally did some reading on tuning the extractor so I took it out and tightened it. I then proceeded to shoot hundreds of rounds without issue. Moral of the story, if you have stove pipe issues make sure your extractor has enough tension before messing with springs.

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Re: 9mm springs

Post by JIMPGOV on Fri Jun 16, 2017 2:33 pm

Larry, i run a 19lb main spring , with a 13lb recoil spring with a slide mounted ultradot.

But my ammo is about 1125 fps. Not a softball load at all. But it will shoot about 1 inch at 50 yds from the ransom rest. Jp

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Re: 9mm springs

Post by Jon Eulette on Fri Jun 16, 2017 4:10 pm

Just got back from shooting a new 9mm RO I built. AA Match 115 gr jhp dropped brass neatly in a pile 3 ft to my right. Aimpoint Micro slide mounted on small base at rear of slide. KKM 1:32 barrel 10# recoil spring and 19# mainspring.
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Re: 9mm springs

Post by Larry2520 on Sat Jun 17, 2017 2:05 pm

Thanks for the replies guys! Right now I'm shooting a 126 Zero JHP with @ 4.3 grains of 700x behind it with a slide mounted Ultradot. I don't have a chrono so I don't know the speed. I am using a KKM 1-32 twist barrel and I'm impressed with it. Once I get it more reliable I'll be very Happy.

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