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Posted: 12/28/2025 12:00:46 AM EDT
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Do open-bolt semi auto Mac10's fire like an FRT-equipped pistol? According to this video, they force a reset of the trigger, also known as trigger slap.  Semiauto Open-Bolt MAC-10 (They Made More than 100,000 of These) I am NOT asking about full auto conversion. I didn't ask, I don't want to know, please don't post it here. I'm just curious how trigger slap affects the function in a pre-frt world. If you apply constant pressure, does it allow for rapid reset and trigger pull? |
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No, Ian was incorrect about that. In semi-auto mode (SMG or SAP), the forward movement of the bolt pushes down the front of the trip lever, as Ian stated. The rear of the trip lever then pushes up on the disconnector (the part pinned to the trigger), which pushes the disconnector off of the sear. The sear then pops up via its spring, and catches the bolt, ready for the next shot. When you release the trigger, the disconnector rises and the trigger/disconnector spring pushes the disconnector back into engagement with the sear. At this point, pulling the trigger will fire the weapon once again. Open bolt MAC firearms do not have trigger slap, nor does the firing cycle "force the trigger forward". |
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Originally Posted By Stahlgewehr762: No, Ian was incorrect about that. In semi-auto mode (SMG or SAP), the forward movement of the bolt pushes down the front of the trip lever, as Ian stated. The rear of the trip lever then pushes up on the disconnector (the part pinned to the trigger), which pushes the disconnector off of the sear. The sear then pops up via its spring, and catches the bolt, ready for the next shot. When you release the trigger, the disconnector rises and the trigger/disconnector spring pushes the disconnector back into engagement with the sear. At this point, pulling the trigger will fire the weapon once again. Open bolt MAC firearms do not have trigger slap, nor does the firing cycle "force the trigger forward". Stahlgewehr is correct. SAPs have no trigger slap. They are essentially the same FCG as the FA Macs but have no selector and are stuck in semi auto. Like any other SA open bolt or striker fired gun they have an arm that is hit by the bolt that releases the sear allowing it to pop back up. |
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Originally Posted By Deerhurst: Stahlgewehr is correct. SAPs have no trigger slap. They are essentially the same FCG as the FA Macs but have no selector and are stuck in semi auto. Like any other SA open bolt or striker fired gun they have an arm that is hit by the bolt that releases the sear allowing it to pop back up. I am confused. He says (and shows) at 7.00 that it forces the trigger? |
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He was "pussy-footing" the trigger and trip lever when he demonstrated it. In actual function with live ammo, the bolt hits the trip lever pretty hard when it slams forward. Additionally, the shooter's trigger finger will be holding the trigger fully to the rear, with a lot more force than Ian does in his vid. Both the fast-moving bolt hitting the trip lever, and the trigger being pulled firmly to the rear allow the trip lever to push the disconnector off of the sear. This can be done with the upper off of the lower receiver, but you have to push down somewhat hard on the trip lever. It can easily be done by dry firing the MAC while it is assembled, but you can't show that in a video. Ian's demonstration didn't allow the disconnector to "disconnect" from the sear. He just softly rocked the parts back and forth... |
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