Super 42 buffer Spring

**Alaska3006** · 03-16-21, 22:36

Just order a super 42 rifle length for my MK12
Anyone have experience with the braided buffer spring in the rifle length?

**LowSpeed_HighDrag** · 03-19-21, 09:49

Not in the rifle length, but I do run a carbine length with an H3 buffer in my MK18 and it tames the beast when suppressed.

**Alaska3006** · 03-19-21, 12:23

Seems like a no brainer
The braided spring being used for years in different machine guns and assault weapons.
My rifle works great with the JP Tuned spring but I thought I give the braided spring a try for extra reliability.

**Warp** · 03-19-21, 14:56

Originally Posted by Alaska3006

Just order a super 42 rifle length for my MK12
Anyone have experience with the braided buffer spring in the rifle length?

I'm not sure I understand the application for this spring.

Has Bill stated that the Super 42 springs are intended to only be used with the Geissele branded buffers? And aren't they Carbine sized buffers? I'm not understanding how a rifle length spring and a carbine buffer mix.

I have the Super 42 in the carbine buffer/spring configuration and it's very nice, even short barrel suppressed. Heavy buffer though. H3.

**themonk** · 03-19-21, 17:39

I had one but gave it away as I moved all my guns over to the A5 system. It was fine but the lack of industry adoption, you used to have to buy additional tungsten weights if you wanted to increase the buffer weight, no advantage over sprinco springs, it didn't seem worth it. I got a wider range both suppressed and unsuppressed with the A5.

**Clint** · 03-20-21, 11:17

The S42 Rifle length spring is compatible with regular diameter rifle and A5 buffers, unlike the Carbine version.

User feedback with the Carbine S42 indicates the 15% extra strength requires a minimum gas port one or two sizes larger than normal.

Originally Posted by Warp

I'm not sure I understand the application for this spring.

Has Bill stated that the Super 42 springs are intended to only be used with the Geissele branded buffers? And aren't they Carbine sized buffers? I'm not understanding how a rifle length spring and a carbine buffer mix.

I have the Super 42 in the carbine buffer/spring configuration and it's very nice, even short barrel suppressed. Heavy buffer though. H3.

**BmNJ** · 03-27-21, 22:06

I have a rifle length Super 42 in an A5 buffer tube with a A5H2 buffer. 14.5" barrel with carbine gas. Only have gotten to shoot about 100 rounds through it with 55g 223 but no issues and shot smooth.

**Mysteryman** · 03-28-21, 04:55

Originally Posted by Clint

The S42 Rifle length spring is compatible with regular diameter rifle and A5 buffers, unlike the Carbine version.

User feedback with the Carbine S42 indicates the 15% extra strength requires a minimum gas port one or two sizes larger than normal.

Sorry, gonna call BS in the carbine buffer claim. Been using a non Geissele buffers with my carbine 42 springs with zero issues in several thousand rounds. Measured the buffer that came with it against several others I have, all measure out to within 0.005" so in practicality, they're identical.