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Message: <blockquote data-quote="dennishoddy" data-source="post: 3845632" data-attributes="member: 5412">I'll dive into adjustable gas blocks.The combination of the amount of gas being sent to the BCG to cycle the action in combination with the buffer weight and buffer spring should cycle the action just enough to not fully compress the buffer spring yet complete the cycle of ejection and stripping a new round from the mag.As with any semi auto firearm you don't want the slide/action to slam to the stops as it creates more recoil and will eventually cause breakage.So, with that in mind, there is so much difference in ammo that one can cause a softer recoil impulse while another can result in a higher felt recoil.The purpose of the adjustable block is to find the most accurate sweet load for your rifle and be able to tune it so that it completes the cycle with the minimum of recoil.That is also the purpose of reloading so one can find that perfect load and repeat it to maintain that tune.You can achieve the same purpose by changing buffer weights and spring weights, but the adjustable gas block only requires an allen wrench to tune.Yes, there are occasions where changing buffer weights and springs are required and there is no other solution.</blockquote>