I've done it with an old flatback staggered feed. I took a model 11GL in 243 and changed it over to an 11 FLC in .308 configuration with factory takeoff parts from the classifieds here. The use of factory parts made the project smooth and painless. out with the old and in with the new. I also made a few more mods and wound up with this nifty little decked out carbine.