Grendel LMG

[stanc]

The links that MGA made for the 6.8 could probably be stretched just a hair the same way we stretched M27 links for 5.45 (which worked well).

Yeah, I'd also think that MGA M68 links could be stretched enough to fit the 6.5 Grendel case, since I was able to press a 6.5 Grendel round into 6mm SAW links for the photo below.
http://www.65grendel.com/forum/attachmen...1512409001

But then you have to mod the feed tray a bit, no big deal - but you really need to increase the height between the feed tray and the top cover since you made the cartridge "fatter". Then you need to change the geometry of the feed lever for the increase in belt pitch forced by the increase cartridge diameter.

Feed tray mods: Due to the minimal cartridge shoulder protrusion in front of the link, wouldn't it be necessary to reconfigure the cartridge stop to have a squared-off, lower-left corner, as shown by the red "L" in the photo above? Wouldn't the links be likely to hang up on such a sharp corner?

Top cover mods: Is there enough case shoulder (on 6.5 Grendel) extending in front of the links for the front feed pawl to push against? Compare shoulder extension of 6.5 Grendel (above) to that of 5.56 (below).

This is why I am kit-bashing an RPD onto my SAW, much faster fabrication time so I can get shooting and prove a concept.

What concept do you want to prove?



P.S. I am surprised that 5.45x39 reportedly worked well in (stretched) M27 links. Because the base-to-shoulder dimension of 5.45x39 is little greater than on 6.5 Grendel, I would've expected you to encounter the same issues with the cartridge stop and feed pawls as I noted above. Did you have these issues, and if so, how did you deal with them?