ALG Defense Quality Mil-Spec Trigger (QMS)

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Out of stock

1. Performance Advantages for the Shooter
The ALG Defense QMS trigger pull is smoother than a stock trigger. This is accomplished by honing the sear surfaces smooth while not removing metal below the valleys of the stock surface finish.
Sear geometry has not been changed from standard so the high reliability that the stock trigger is known for is unchanged.
Trigger and hammer are made from true 8620 alloy steel military specification castings, correctly carburized, quenched and tempered for high surface hardness.
Disconnector is 1070 High Carbon steel properly Austempered into the spring range of hardness
Springs are corrosion resistant and meet military specifications.
A full force hammer spring is used for positive ignition of all type of ammunition.
Trigger and hammer pins are improved over stock mild steel by using 4140 Chrome-Moly steel that has been quenched and tempered. Pins are centerless ground to a fine finish and a diameter 0.001 larger than stock to reduce play in the trigger assembly while retaining a slip fit into the weapon lower receiver.
Pull weight is above the U.S. Military minimum pull weight of 5.5lbs but does not reach near the upper limit of 9.5lbs. Generally, the pull weight is about 6.5lbs.

2. Advantages for the Armorer
The ALG Defense QMS trigger is an enhanced standard trigger so maintenance and installation procedures are unchanged.
There is spare parts commonality between the QMS and stock triggers
Trigger assembly parts may be interchanged between triggers, there are no matched sets.
Since it is a trigger meeting the U.S. Military trigger specifications for the M4 Carbine, the ALG Defense QMS can be substituted for lower performing stock triggers while still staying in compliance with Unit or Departmental requirements.


***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit***

34 Reviews

  • 5
    Very Nice Trigger

    For the money spent ya cant beat the QMS trigger! Better than most Mil Spec triggers ive felt. Very happy with it.

  • 5
    ALG Defense Quality Mil-Spec Trigger (QMS)

    for a replacement drop in trigger this one is FAR better than the original Mil-Spec triggers. nice clean break and almost no creep at all. for the money this trigger is a nice improvement. i would recommend this trigger to anyone who wants a new trigger without spending a lot of money.

  • 5
    ALG-QMS Trigger for the XM15...

    Wow, I just cannot say enough about ANY experience I have regarding BCM. There literally has NEVER been a negative experience, much less a 'bad' one. At this point in time I really can't believe I don't own a BCM RIFLE either. To date, most all experiences have been along the accessorizing lines...BCM parts, spring kits, lower kits, etc. I have probably THE BEST grips on my 'go-to' rifles, both are Mod 3 Gunfighters (Black/FDE). Absolutely LOVE 'em! The survey is in regards to the 'QMS' though. I figured I'd give ALG another shot due to already having an 'ACT' in my Colt 6940 and they BOTH perform really well. I wasn't looking to move away from a mil spec trigger as I saw no need as the reliability is there and proven. I DID think long & hard about the 'PNT' and I suppose at BCM's price point I'll be trying it out too! Perfect American company and will always have my repeat business. "Bravo", Bravo Company! Thanks, Mark

  • 5
    Great trigger for the price

    Cannot be beat for the money. My old LPK had a horrible trigger. Sloppy take up, tons of creep, reset was like 10 miles of gravel road even after close to 2000 rounds and a hand polish.. I knew I wanted something consistent with a clean break and reset, but I didn't want to reduce the pull weight or sacrifice reliability with different types of ammo. The QMS has a very very tiny bit of creep and a clean break with a smooth and positive reset. It's a great duty/combat trigger that's really great all around. It truly is night and day better than all the basic LPK triggers I've tried.

    Hats off to BCM..ordered at 11pm Friday night and it was in my mailbox Monday afternoon. Can't beat that.

  • 5
    Love it

    Easy to install for someone who has never done it before. It does exactly what it is supposed to. No grit when pulling the trigger. It breaks nicely, and is very consistent.

  • 5
    Trigger purchase

    Awesome turn around time and amazing quality. Love BCM! Thanks for all the sweet stickers too!

  • 5

    Great product! Fast shipping!

  • 5
    ALG Defense Quality Mil-Spec Trigger (QMS)

    Bought two sets for future builds. Own other ALG products and have been pleased.

  • 5

    This is the third ALG QMS I've bought, and every one I get it surprises me how amazingly smooth the break and reset are.