MBX buffer tuning.

[SWprotected]

I have two PCCs both have the MBX system in them. Both guns are built on PSA lowers, Uppers are just mil-spec. Triggers are Hiperfire 24c and both have Faxon bolts. The older of the 2 guns has a 16" JP barrel and the newer of the 2 has the MBX light weight barrel. I currently have both buffers set up in the longer configuration using the yellow MBX spring and the red internal spring. Both are setup so that when you pull the charging handle the buffers makes first contact just past the point of the trigger resetting. Both guns runs reliably with pretty much every load I have run in them and both guns have about 3k through them.  My current load is 135gr. Blue Bullet and about 142PF.

My question is have you experimented with the different internal buffer springs and the buffer length and if so what where your conclusions. I am looking to make the guns a little flatter, not really worried with softer.

[Bwillis]

 

the flattest setup I’ve used to date with my mbx buffer. The red starts to work better around 150+pf. 

[SWprotected]

It sounds like they are both using the buffer set for the shorter length with the blue internal spring, and of course the amount of short stroke will depend on trigger reset. I need to get to the range and experiment with this.