First build

[sarky]

So this is my first Grendel upper build, I have a 16 inch group buy barrel and bolt, a Gibbz side charging upper, Adams Arms piston system with light weight boron carrier and a Yankee Hill M-Lok hand guard. I also swapped out the buffer system in the lower with a JP Enterprises captured spring system.
Now, the things I still need, firing pin. Does it matter which one I get?????? And a Muzzle break, Any recommendations as which muzzle break to get for the Grendel??
I am also considering the DOLOS quick change barrel system, so I can switch from the 16 inch barrel to a 20 inch. Anyone have any experience with this?

[mdram]

the group buy bolt should use a standard mil spec firing pin

[sarky]

Any thoughts on a muzzle brake?

[A5BLASTER]

Standard mil spec firing pin with that bolt.

I have been using the m4-72 severe duty and it does a awesome job but boy is it loud and throw a concussion wave.

If you got adjustable gas block and the scs system, I would pick up a righttobear arms lowmass stripped bcg for 60 bucks and complete the lowmass system.

[Neanderthal]

I'm using the same group buy barrel and bolt in my recent build. I put a VG6 Epsilon 65 muzzle device on mine and love it! As others have said, yours will take a standard firing pin. I have no experience with the DOLOS, but it does sound interesting.

[Redomen]

I like my Odin Atlas comp.

[Djgrendel]

Is the quick change barrel faster than pushing two takedown pins to swap uppers?

[Sixoeight]

I can't imagine many scenarios where a 20" change is needed over a 16 unless you are doing ultra long distance competition in which case you would usually build a dedicated rifle. Just my thoughts on it

[sarky]

Actually it is a good deal quicker

[Bigs28]

If your using a lightweight carrier i recommend adjustable gas.

Muzzle break? If you ever plan on getting a suppressor buy the brake that goes with it. If not the vg6 is pretty good.

[sarky]

The Adams arms carrier is light weight and it is an adjustable piston system. I have been looking at both the Atlas 6.5 and the VG6. From the looks of things, this will be a semi-custom build as I will need to get the hand guard milled to make clearance for the piston system. I need to find a good machinist.