The R25 is a scaled up AR15, so no, most parts will not interchange.<br>
The R25 is a decent gun, though heavy.<br>
My 308 is an old Belgium FN FAL 50.64 Para (came in a Browning sporter box). There's no doubt it's reliable, and is a bit lighter than the R25. But FALs are a pain to scope, and the R25 is designed with optics in mind.<br>
It's ironic that I bought the FAL so I didn't have to take my antique rifles and Browning 1885's and 1886's out into bad weather. But now the FAL is worth more than they are.
Brian, I have several FAL's and the DS arms Para Congo with their scope mount is rock solid (10 clamps)will shoot 1 1/4 to 1 inch groups with 168 Gold Medals hand feeding and the gas turned off. I also have a FNC para 16" barrel that I got new for $479. but not as accurate as the 308's