MBX rifle or other for new purchase?

[assaultthesalt]

Over 5k trouble free rounds though my MBX now :) Im running a 100grn projectile moving 1310 FPS ( 131 PF ) w/ the Blue recoil spring in the MBX System.Dot barely moves.I know my loads are on the short side and I dont have any issues. I will get measurement when I get home in the morning. 

[assaultthesalt]

Measured my load. OAL 1.100

[RandyBaker]

Have you broken any firing pins in the 5000 rounds?

[assaultthesalt]

7 hours ago, RandyBaker said:

Have you broken any firing pins in the 5000 rounds?

No sir. Still running strong :)

[RandyBaker]

Good to hear. I have read that for some reason people with a PCC seem to break firing pins for some reason and didn’t know if that was manufacturer specific or just part of the game.

[rowdyb]

my range bag spares kit does contain an extra firing pin.

[waktasz]

What pin are you using? Anything special?  I just replaced my with a titanium one just in case. 

[mikey_golds]

I'm going to recommend the CMMG bolt and barrel. You aren't going to go for it because reasons... But I did my part.
 
Once you know, you know.... Almost no one knows yet.

What receiver did you use since it needs the biggest port


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[Bifurcate]

On 8/25/2019 at 6:20 PM, mikey_golds said:

What receiver did you use since it needs the biggest port

 

 

Sorry I'm just getting to this now.

 

The 9mm does not need a different sized port. 40 and 45 do, but 9mm is about the same size as 556 just shorter.

 

HOWEVER... I chose the Aero XL upper because it's a larger port made for 458 because I wanted to make sure if there was a malfunction I could get more of my hand or tool in there. So, while it does not need it, I think the Aero XL upper is excellent. I'd strongly consider putting one of these on my next 556 built. For reference, the dust cover is the same size, but it's just a slightly larger milled hole.