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Trident just confirmed that the nuts are compatible in his last post. You can interchange any length MKI, MKII or MKIV rail on either the old steel nut or the new aluminum nut if I'm reading him right.
My point is I don't see any reason to buy one with the steel nut moving forward if the aluminum one does everything the same yet shaves two ounces off. I'm not saying to trash all your steel nuts but if the aluminum ones are available separately from Geissele (and reasonably priced) then why not swap them out?
It's a smart move by the company. He's really keeping the "modular" in SMR. Thumbs up.
So if I'm correct, a 15" MK1 is 1.26 pounds. With the new barrel nut it will drop 2.26 ounces to 17.94 ounces or 1.12 pounds including everything needed to install and run? In comparison to the C4 12" handguard that is on the new BCM upper I just bought, that weighs "14.2oz with screws---1.1oz with standard barrel nut" its almost exactly the same? Granted that weight is including full quad rail but still.
I didn't see it, but how does the MK4 handle? Is it more like the MK1 or MK2? And did we get a word on whether the keymod version will have the fixed rails at the end?
If I get around to it tonight I'll do some comparison photos of the MK 1 VS MK 4. Please keep in mind that the MK 4 is not finalized and is subject to change. They're not currently available for purchase but the new lightweight barrel nut is. There is no ETA for when the MK 4 will be available for purchase.
Edit: Sorry folks - can't deliver on the comparison photo. The wife installed it on her stick before I had a chance to tell her I wanted to use it for some photos. If you guys want images with it mounted, then I can do that.
Last edited by RXM; 01-24-13 at 22:52.
Mk1 13" in stock here.
http://www.rainierarms.com/?page=sho...roduct_id=3225
Last edited by ARonBoard; 01-24-13 at 19:32.
darn...too slow! now OOS
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