Professional Soldiers ® - View Single Post - Trigger, Safety, and Springs for AR-15

JGarcia · 02-01-2006, 04:21

I've searched the threads pertaining to the inner workings of an AR-15 lower receiver. Naturally I have a couple of questions.

I bought a new DPMS stripped lower receiver, and I want to build a good lower for the new POF-415 upper I am buying. The purpose of the finished carbine will be to practice shooting, to take to Thunder Ranch on occasion, to spend money on, and to take to the range with my son. I am settled on the upper, all of my questions will be about which parts to buy for the lower and why. So, I thank you for your time spent in reading and answering my questions.

I am considering installing a two stage national match trigger from a company called Geissele Automatics. The trigger was reviewed (complete with photos) at ar15.com. Here are a couple of quotes from what I read there:

"...lock time with this trigger has been calculated at 8ms. This is an improvement of almost 50%. The shorter lock time can actually be felt by the shooter.

The hammer has also been designed to incorporate its “center of percussion” as near as possible to the firing pin longitudinal axis. When impact occurs on or near a rotating object’s center of percussion the reaction at the pivot point is minimized."

"Sear engagement and 2nd stage weight are two separate adjustments on this trigger. No trade offs will have to be made between a light 2nd stage pull weight and a sharp 2nd stage break. With a separate sear adjustment, machining tolerances of the receiver are minimized and each trigger can be tuned for a perfect, crisp let off.

There is an overtravel adjustment screw that can be adjusted for shooters who want very little trigger movement after the 2nd stage break. Conversely, the geometry of the trigger has been designed to allow for maximum overtravel for shooters who want to ensure the projectile has exited the barrel before the trigger comes to a hard stop. Shooters that compete in National Infantry Trophy Team matches (600yds of rapid fire) might find the overtravel adjustment of most benefit since minimal overtravel will decrease trigger reset time and allow the trigger cycle time to be minimized."

Do any of you think it would be advantageous to use a two stage national match trigger or the geissele trigger rather than a stock trigger?

02-01-2006, 04:21	#1
JGarcia Guerrilla Join Date: Feb 2004 Location: San Miguel, CA Posts: 407	Trigger, Safety, and Springs for AR-15 I've searched the threads pertaining to the inner workings of an AR-15 lower receiver. Naturally I have a couple of questions. I bought a new DPMS stripped lower receiver, and I want to build a good lower for the new POF-415 upper I am buying. The purpose of the finished carbine will be to practice shooting, to take to Thunder Ranch on occasion, to spend money on, and to take to the range with my son. I am settled on the upper, all of my questions will be about which parts to buy for the lower and why. So, I thank you for your time spent in reading and answering my questions. I am considering installing a two stage national match trigger from a company called Geissele Automatics. The trigger was reviewed (complete with photos) at ar15.com. Here are a couple of quotes from what I read there: "...lock time with this trigger has been calculated at 8ms. This is an improvement of almost 50%. The shorter lock time can actually be felt by the shooter. The hammer has also been designed to incorporate its “center of percussion” as near as possible to the firing pin longitudinal axis. When impact occurs on or near a rotating object’s center of percussion the reaction at the pivot point is minimized." "Sear engagement and 2nd stage weight are two separate adjustments on this trigger. No trade offs will have to be made between a light 2nd stage pull weight and a sharp 2nd stage break. With a separate sear adjustment, machining tolerances of the receiver are minimized and each trigger can be tuned for a perfect, crisp let off. There is an overtravel adjustment screw that can be adjusted for shooters who want very little trigger movement after the 2nd stage break. Conversely, the geometry of the trigger has been designed to allow for maximum overtravel for shooters who want to ensure the projectile has exited the barrel before the trigger comes to a hard stop. Shooters that compete in National Infantry Trophy Team matches (600yds of rapid fire) might find the overtravel adjustment of most benefit since minimal overtravel will decrease trigger reset time and allow the trigger cycle time to be minimized." Do any of you think it would be advantageous to use a two stage national match trigger or the geissele trigger rather than a stock trigger? __________________ National Guard Marksmanship Training Center
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