You guys made me do it...ordered Mike's last B50

[SpiralGroove]

Hey Ray,
Do the pre-load spring mod. in rsterne's post using the Marauder spring.  Just screw in (increase) the pre-load until your happy with the velocity.  My BAM's are not that loud at about 900/950 fps, but I have also increased the valve/transfer/barrel ports to give me better air flow, requiring less hammer pre-load/hammer strike/noise at a given velocity.

 

[mobilemail]

I got to shoot mine outside the first time yesterday. Ragged hole groups at 25 yards with JSB Monsters. To be honest, I haven't done the mods I've read about. I replaced the bad O-rings, filed the hammer screw so it wouldn't drag, polished the hammer a little, and installed the new poppet in the valve, and set the striker out more. As it is, I get 30 very nice shots !1000-1500spi, at 20fpe, 3.2% ES with acceptable muzzle noise.  At this point, I'm ready to put a regulator in it just as it is, just to up the shot count, and call it done!

Oh yeah, I shortened the stock for my stubby arms.

[SpiralGroove]

Yeah Mobilemail,
I believe MartyB kept the original hammer/spring guide and only replace the pre-load spring with the Hammels #152 and replaced the stock valve spring with the Hammels #83 spring.  The cost of the springs is about $4.  The next mod would be to open all valve/transfer/barrel ports up to 9/64".

With the above mods and a regulator (setpoint 1500 psi) , you'll likely get 60 shots at 900/925 fps. 

[RayK]

I got to shoot mine outside the first time yesterday.At this point, I'm ready to put a regulator in it just as it is, just to up the shot count, and call it done!

Oh yeah, I shortened the stock for my stubby arms.

Smart man!  It is important to recognize when you've arrived at the gun you want/need.

I'm 6 foot tall with long arms and the stock LOP is too long for me too.  I wonder who they designed it for?

Ray

[mobilemail]

Smart man!  It is important to recognize when you've arrived at the gun you want/need.

I'm 6 foot tall with long arms and the stock LOP is too long for me too.  I wonder who they designed it for?

Ray

[Tater]

Congrats Mark. Hopefully you can make the fun shoot in May, maybe I could check it out. Sounds like a nice shooter.

[mobilemail]

I have the event on my calendar, no obstacles at this time. I would be happy to share my toys!