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<blockquote data-quote="Bed Wetter" data-source="post: 48486" data-attributes="member: 428">For an excellent explanation of direct impingement vs. short-stroke piston rod from our conservative friend Stewart Mills of Mills' Fleet Farm, jump to 1:30 in the video:<a href="http://youtu.be/xM3oMlphZiw" target="_blank">http://youtu.be/xM3oMlphZiw</a>- - - Updated - - -Also, there are short-stroke piston rifles and long-stroke piston.Short-stroke: pocket of expanding gas pushes a rod back, which contacts the bolt carrier forcing it back as well. The rod/piston only contacts the bolt carrier for a short distance, allowing momentum to carry the bolt carrier all the way back. Short stroke rifles: POF, LWRC, FN SCAR, FN FAL, VZ58 (I think), Adams Arms/Huldra, AR180, Sig 716/516, Sig 550 seriesLong stroke piston: works like a short stroke piston except the piston/rod is connected to the bolt carrier, therefore traveling for the entire rearward and forward movement of the bolt carrier. Long-stroke rifles: AK47/74, M1/M1A Garand, Galil, PWS, Adcor BearTo my knowledge, all semi-auto shotguns are either inertia or short-stroke piston. I could be wrong.</blockquote>

[QUOTE="Bed Wetter, post: 48486, member: 428"] For an excellent explanation of direct impingement vs. short-stroke piston rod from our conservative friend Stewart Mills of Mills' Fleet Farm, jump to 1:30 in the video: [url]http://youtu.be/xM3oMlphZiw[/url] [COLOR="silver"][SIZE=1]- - - Updated - - -[/SIZE][/COLOR] Also, there are short-stroke piston rifles and long-stroke piston. Short-stroke: pocket of expanding gas pushes a rod back, which contacts the bolt carrier forcing it back as well. The rod/piston only contacts the bolt carrier for a short distance, allowing momentum to carry the bolt carrier all the way back. Short stroke rifles: POF, LWRC, FN SCAR, FN FAL, VZ58 (I think), Adams Arms/Huldra, AR180, Sig 716/516, Sig 550 series Long stroke piston: works like a short stroke piston except the piston/rod is connected to the bolt carrier, therefore traveling for the entire rearward and forward movement of the bolt carrier. Long-stroke rifles: AK47/74, M1/M1A Garand, Galil, PWS, Adcor Bear To my knowledge, all semi-auto shotguns are either inertia or short-stroke piston. I could be wrong. [/QUOTE]

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