I have both and both are great guns. Neither are worth the current cost of them. I was an early adopter of the Arsenal guns so in at a much lower cost. The SAM-SF is longer than most AKS due to the folding mechanism. Very smooth as all milled AKS are. Great guns, heavy and reliable. The SGL21 is probably the closest thing to a Russian AKM other than the Egyptian Maadi. I think you could almost buy a Maadi for what some of these Arsenals are being sold for. IMO right now the best deal on an Arsenal is the SLR-107R that KVAR has as well as Atlantic and others. KVAR had the best price and with the proximity to Vegas gets to you in a couple days. They wont last long gougers are buying 5 or more at a time and waiting to resell when there gone.