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Old October 10, 2012, 03:18 AM   #74
Metal god
Senior Member
Join Date: April 10, 2012
Location: San Diego CA
Posts: 2,028
Direct Impingement gas system /Gas Piston system

Direct impingement gas system ( DI ) is a completely gas operated system . some of the gases when fired down the barrel are redirected through the gas block back down the gas tube and in to the gas key /BCG and that cycles the next round . A gas piston system uses a piston to push the BCG back to cycle the next round . It is similar but very different . The gases get redircted through the gasblock same as a DI but instead of going all the way down the gas tube it's blocked by the piston . The piston is then pushed back through the upper receiver cycling the BCG . The piston system never throughs hot gases and fouling in to the upper receiver and BCG . The piston system will keep the bolt carrier and upper receiver cleaner while in use but has more components to fail . The BCG and gaskey are just a part of the over all systems . although the BCG for each system are not interchangeble as far as I know .

Here is a video showing how each work

Before you ask which one is better, DON'T. All it will do is spark an argument .

As of this date 8-18-14 at 6:42am I became a proud grandfather I guess I'm officially old

Last edited by Metal god; October 10, 2012 at 11:39 AM.
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