My opinion, based on experience, is that military rifles with full powered cartridges, (30/06, 7.62X51MM) are not suited to full automatic fire. M-14's are great, accurate rifles. Light machine guns, they are not. The FN SLR falls into this category. If you have ever fired a fully automatic M-14 you know that it's uncontrolable. Your first shot may be on target, the rest are anti-aircraft. Even it's M-14E2 guise, with a bipod, It skitters around and does not give a "beaten zone" or a cone of fire. Even at 12.5 lbs. the E-2 was 7 lbs. lighter than the BAR it was designed to replicate. I could fire an M-60 Machine gun from the shoulder and hip and keep the rounds pretty much on target. The M-60, however, weighs 23 lbs. The M-16A1 could be held pretty steady on full automatic and the M-16A2 was better. AK-47's can be fired effectively in the full automatic mode. Both the weapons fire an "intermediate" cartridge. The SAW was a great idea, .223 fired from a stable, full automatic platform. M-60's and FN MAG's for support. Once in a while we get it right. I don't like the M203's on M-16's, I think the M-79 dedicated grenadier was a better idea. But I'm an old war horse. Where is that flintlock?