[Perdogg]

There is nothing wrong with the M4 other than the 5.56mm round. Replace the the 5.56mm with the 6.5mm X 39mm grendel.

[Rammer]

And it poops where it eats.

[fireforeffect]

What about the:

6.8 X 43 SPC,

6.5 x 45 APC, or

6.8 X 45.

The Grendel requires new bolt and a new magazine to function, has a significantly reduced magazine capacity, and an unacceptable increase in weight (210 rounds in magazines). The 6.8 SPC suffers from the same defects.

The 6.5 x 45 and the 6.8 x 45 use the same bolt face and magazine (with minor modifications) as the 5.56 X 45 with minimum increase in weight.

[Vinnie]

Replace the the 5.56mm with the 6.5mm X 39mm grendel.

YES,Yes