VBS with a MAX 31

[MDG]

Does anyone know if Richard's VBS can be used with a MAX 31? I know I can email him but I don't want to wait until Monday for an answer.

 

[ChuckB]

Max-31 Mk2 can use 2 VBS.

 

[MDG]

It seems as if I've heard it won't work with the MAX 31 but I don't know why.

 

[medphys]

Get some erasers and try it

 

[MDG]

I'll do that right away. hehe

 

[THM7]

Yes they work in both Mk1 and Mk2 Max-31's, they are just basically buffers that regulate bolt rear-ward movement.

 

[MDG]

Is it possible this addition could have an adverse affect on the upper?

 

[THM7]

NO....just a shorter recoil stroke.

 

[MDG]

Thanks for the info.

 

[ChuckB]

I saved the post I made above from when I asked Lage.

I'll assume the risk of adding too many VBS is either the bolt won't lock back, or won't catch the sear when you let off the trigger.

 

[MDG]

That makes sense. I don't think the MAX 31 is made to use with the VBS.

 

[medphys]

That makes sense. I don't think the MAX 31 is made to use with the VBS.

Correct. You can short-stroke it somewhat, but too much and you may experience runaways.

I think Richard sells a speed bolt for the 31.

 

[MDG]

I'm sure I ordered it with the speed bolt. It supposedly runs 900 to 1000 RPM. I'll check with them Monday to make sure. I certainly don't want to destroy a $900 upper for an extra 100 RPM or so. Thanks.

 

[medphys]

You're not going to hurt it. It's built better than the lower it's attached to

 

[THM7]

You guys can check with Richard but I have used two VBS in my Max-31 Mk2 without issue. Why have a "Speed Bolt" and VBS that do about the same thing...really don't know. A different option is what I assume...but I can assure you the VBS works fine in the -31. If it runs away I would suggest hotter ammo.

 

[THM7]

If you are talking about the first Gen -31... No issues with that either. One is made of steel and the other Alum the design-spec's are the same. There were some improvements on the Mk2 but they are basically very similar as far as functionality.

 

[THM7]

Actually....I stand corrected. After a quick test my -31Mk1 with the latest bolt design. It worked with both one and two VBS blocks. With the older bolt it only worked with one VBS block. Sorry if I lead anyone down the wrong path. I always use the newer bolt because it seems a bit more reliable.