Pastor12

Thanks for the info on Olympic Arms, been in contact with them, looks like they may be able to help me out using their UMAR platform.

I have thought of the 6creedmore, I too am trying to use the 105 & 108 Berger VLD The 6mm AR Turbo is built by Robert Whitley. It's a necked down 6.5 Grendel case. Here's the web site http://6mmar.com/6mmAR_Turbo_40_Improved.php

Boy you are a wealth of information. I was thinking a rifle length gas tube, but the adjustable gas block makes sense. What I've heard a great deal that generally the AR is over gassed, which is why rifle length came to mind. When you say oversized lower that means just in the magazine area, with bolt and everything else the same?

It would seem like I'm caught in the middle, too big in some ways for the AR15 and too small in other ways for the 308. As far as cycling do you think a regular gas tube and gas block will have enough gas to cycle it? I figured that the barrel extension/feed ramp would be the biggest issue. If that's the case how would one go about getting a modified extension? BTW thanks for your insights.

Are you saying that the dasher won't cycle in a .308? One of the main reasons I'm looking at the .308 frame is that with the AR15 the magazine length becomes a real issue loading anything more than an 80 grain bullet. I have a 6mm ar turbo built by Robert Whitley and I have to go in .045 from the lands just to fit the magazine. This begins to cause other issues with seating etc. He used the 6.5 Grendel case in order to fit the AR15 bolt. Dasher aol is 2.408 the AR15 mag is approx 2.315, even if I get a bolt to work I'm still seating the bullet nearly .100 into the case. As to why the dasher over the 243, yes they are similar but the dasher certainly has become much more popular with bench rest shooters, accuracy, less powder, doesn't burn up barrels.

New to this forum, must say I've already learned some new things. I'm trying a special build, building a 6mm dasher on .308 frame. Has anyone tried this? If so, what issues did you run into? I've already realized one issue is going to be feeding into the chamber. Was wondering about modifying the barrel extension to change the feed ramp. Thanks for any help