Home Forums Hunting & Shooting Ask The Gunwriters How to lighten an AR-15 trigger

My new Sig M400 Tread is a delightful piece of machinery, but it bottoms out my RCBS trigger gauge at 72 oz (4.5 lbs) and even then isn't close to tripping the trigger.

I get it that a self-defense rifle needs to be one that requires a deliberate pull to set it off, but I'd like to try some target shooting at extended ranges and possibly some hunting with it - and a 6-7 lb trigger pull is just too much.

1. Is there a simple way (read: non-gunsmith) to reduce the pull to somewhere around 3.5-4 lbs, like on my other hunting rifles?

2. Is 3.5 lbs too light for its role as a home protection firearm?

I've been looking at trigger spring kits for around $15 and drop-in replacement triggers for $150-300. Is there anything anyone can recommend somewhere near the lower half of that spread?

As you might have guessed from my post, I've never tinkered with an AR-15 before, so any proposed solutions need to be SIMPLE.

Thanks for any responses, and MERRY CHRISTMAS!

There are lots of good AR trigger options, especially if you're willing to spend $150 or more. Sounds like you want to spend a bit less though, so I'd recommend one of these:

- Rise Armament drop-in triggers, pick one on sale right now from several different places (Primary Arms, Dvor, Palmetto State Armory, etc). The basic one seems to be going for ~$88, and a better model for ~$105. These are a single stage trigger.

- Larue MBT. They were something like $87, not sure what they're going for right now, but they have a good reputation. These are a 2 stage trigger. Edit - they are $80, here: https://www.larue.com/products/larue-tactical-mbt-2s-trigger/

Both of those are good triggers. The Larue has a big following in certain circles, and is a quality trigger. Personally I prefer a single stage and am happy with the Rise triggers for a lower priced single stage.

Hope that helps. Also, you'll get more knowledgeable responses in the black rifle section of this forum.

Timney Calvin Elite is on the top end of your budget, but it seems to be a very nice trigger with a clean 1.5 pound break.

As mentioned, a good bang for the buck trigger.

Link

The Larue is available as a single-stage trigger now also. That is what I would recommend.

I lightened a friend's AR trigger by about half with a simple spring change. Brownells has what you need. Very simple.

Simply replace it! Quick, easy, and “almost” financially painless! memtb

Never tried changing springs, but some friends have, and they say there's no free (or cheap) lunch. They got a lighter trigger pull, but they also started getting mechanical issues such as 20% misfires. NOT what you want in a defense weapon.

I changed springs on one, slightly lighter trigger and no malfunctions. Put a Rock River Varmint on another, much better option. Next time I'll start with a LaRue.

If merely changing springs works for you.....I’m very happy for you. But, for for my rifle it would have been a waste of time. The trigger pull was best described as pulling a rusty chain across the edge of a table. You might have gotten it somewhat lighter.....but, the roughness would remain! memtb

Yeah, why bother with that crap when you can buy a Larue mbt2s or RRA varmint match for around $80.00? I'd just pay the money and get the better trigger... They are easy to replace.

I like the LaRue MBT-2s very much. One of the best $80 a guy can spend to upgrade, IMO. I never tried Rise, but that sale price on a single-stage is pretty enticing. If I had any need, I'd gamble a little cash on that one myself.

Maybe someone can help me out: I'm not following how a lighter trigger spring can cause misfires. Hammer spring, sure thing. But how can a lighter trigger spring cause misfires???

I put a Larue MBT in my Sig M400. Made a world of difference. Excellent trigger with very consistent break.

[quoteI like the LaRue MBT-2s very much. One of the best $80 a guy can spend to upgrade, IMO. ][/quote]

YES! best deal out there.

I have a Sig 400 Hunter (think that’s the designation) and its trigger was HEAVY and rough. Made it really hard to hold good groups. Swapped out to a Geisselle (sp) and, oh man, what a difference. You certainly don’t have to spend that much money but just about anything will beat the stock trigger and a replacement is easy to install.

I would install a new trigger. There are many options and most are easy to install, just a matter of a couple of pins. I like Geiselle triggers, but they are more expensive. For self defense you want something that is 100% reliable and not too light (probably at least 3 lbs).

Another vote for replacing rather than reworking. I like the Timney, though it's more expensive than some others.

I run Timney and Elfmans in my ARs. I like single stages over a two stage. But when it comes to AR triggers there are many options and opinions.

JP spring kit and set screw above grip screw (to take some creep out).
Not the greatest, but an improvement, good enough to make my 16" into a decent yote killer.

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