Pick the trigger type first, then the brand. For a defensive rifle, an enhanced mil-spec trigger like the ALG ACT keeps a duty-weight pull of about 6 lb with a cleaner break. For a general upgrade, a 3.5 lb drop-in single-stage such as the RISE RA-140 or TriggerTech Duty installs as one unit. For precise shots at distance, a two-stage like the Geissele SSA-E (about 2.3 lb of take-up, then a 1.2 lb break) gives a light, predictable break. The pull weights here are the makers' listed figures; we have not measured them.
AR-15 trigger types compared
| Type | How the pull feels | Install | Best for |
|---|---|---|---|
| Mil-spec single-stage | Heavy and often gritty; the M4/M16 minimum is 5.5 lb | Separate hammer, trigger, disconnector and springs | Budget builds |
| Enhanced mil-spec | Same weight class, smoother and sharper | Same as mil-spec | Duty and defensive rifles |
| Drop-in single-stage | Light (often 3 to 4.5 lb), short reset | One cassette, two pins | General upgrades, fast shooting |
| Two-stage | Light take-up, a wall, then a crisp break | Drop-in or separate parts | Precision and longer shots |
| Binary | Fires on the pull and again on the release | Usually drop-in | Fun at the range, where legal |
Mil-spec and enhanced mil-spec
A standard trigger group is a set of separate parts: hammer, trigger, disconnector and their springs, held in the lower by two pins. It is the cheapest option and you can replace one broken part. Enhanced mil-spec triggers like ALG's ACT and QMS keep that design and weight but polish or coat the sear surfaces, so the pull is cleaner without getting light.
Drop-in cassettes
A drop-in trigger is assembled and set at the factory in a housing (a cassette). You drop it into the lower and push the two pins through, which removes most of the fiddly spring work. Most are lighter than mil-spec; if the pins walk out, use anti-walk pins (several cassettes include them).
Single-stage vs two-stage
A single-stage trigger moves in one motion until it breaks. A two-stage trigger has a light first stage (take-up) that stops at a wall; a little more pressure breaks the shot. The total weight can be similar, but the two-stage lets you take up most of it before the shot, which helps precise shooting. Single-stage triggers are faster to run on close targets.
Binary and forced reset triggers
A binary trigger fires one round when you pull and a second when you release. ATF has not treated binary triggers as machine guns, but several states ban them, so check your state first. Forced reset triggers work differently and have their own legal history: see forced reset triggers explained.
Shoe shape and pin size
Flat shoes give a consistent finger position, and many shooters find they feel lighter; curved shoes match the classic AR feel. Nearly all AR-15 lowers use small (0.154 in) pins; a few use large (0.170 in) pins, so check the trigger's listed pin size.
Seven picks, by job
Duty rifle: ALG Defense ACT
A mil-spec style single-stage trigger with a sharper break and a pull of about 6 lb. ALG keeps it at or above the 5.5 lb military minimum, so it suits a defensive rifle. Full details are in our ALG ACT review.
Drop-in single-stage: RISE RA-140 Super Sporting
A 3.5 lb single-stage cassette, sold with a flat or curved shoe. A simple, popular first upgrade from a mil-spec trigger.
Drop-in single-stage, duty-minded: TriggerTech Duty
A 3.5 lb single-stage cassette in TriggerTech's Duty line, also made as a two-stage. Choose it over the RA-140 if you prefer TriggerTech's pull.
Two-stage, separate parts: Geissele SSA-E
About 2.3 lb of take-up and a 1.2 lb second stage, for roughly 3.5 lb in all. It is not a cassette: it installs like a mil-spec trigger, with separate hammer and trigger.
Two-stage drop-in: Timney Targa
A drop-in two-stage with 2 lb in each stage, about 4 lb in total. The short version has a short first stage; it installs with your rifle's existing pins.
Adjustable: TriggerTech Adjustable
A single-stage cassette you can set from 2.5 to 5 lb, so one trigger can run light for matches and heavier for field use.
Binary: Franklin Armory BFSIII AR-Essential
Three positions: safe, semi (one shot per pull) and binary (one on the pull, one on the release). To stop the release shot, hold the trigger back and move the selector out of binary. Not legal in every state.
The seven triggers, today's prices
ALG Defense ACT
Pros
- About 6 lb, sharp break
- Keeps duty weight
Cons
- Not a drop-in cassette
Duty rifle
RISE RA-140 Super Sporting
Pros
- 3.5 lb single-stage
- Drop-in cassette
Cons
- Too light for some duty rules
Drop-in single-stage
TriggerTech Duty single-stage
Pros
- 3.5 lb single-stage
- Curved shoe
Cons
- Fixed weight
Drop-in single-stage
Geissele SSA-E
Pros
- About 2.3 lb + 1.2 lb two-stage
- Installs like mil-spec parts
Cons
- Separate parts, not a cassette
Two-stage
Timney Targa two-stage (short)
Pros
- 2 lb + 2 lb stages
- Drop-in
Cons
- Straight shoe only in this version
Two-stage drop-in
TriggerTech Adjustable
Pros
- Adjustable 2.5 to 5 lb
- Curved shoe
Cons
- Single-stage only
Adjustable
Franklin Armory BFSIII AR-Essential
Pros
- Safe, semi and binary
- Release shot can be cancelled
Cons
- Banned in some states
Binary
Compare every AR-15 trigger with today's prices, or add one to a build in the AR-15 builder. Installing one? Follow how to install an AR-15 trigger, and see how an AR-15 trigger works for the hammer, disconnector and reset. Left-handed? See ambidextrous lowers and controls.
Frequently asked questions
What is the best AR-15 trigger?
For a defensive rifle, an enhanced mil-spec trigger like the ALG ACT. For a general upgrade, a 3.5 lb drop-in such as the RISE RA-140. For precision, a two-stage like the Geissele SSA-E or Timney Targa.
Is a single-stage or two-stage trigger better?
Single-stage triggers are simpler and faster on close targets. Two-stage triggers let you take up most of the weight before the shot, which helps at distance. Neither is better for every rifle.
What is the difference between a drop-in and a standard trigger?
A standard trigger is a set of separate parts you assemble in the lower. A drop-in is a factory-set cassette that goes in as one unit with two pins.
What pull weight should a defensive AR-15 trigger have?
Many shooters keep a defensive rifle near the military minimum of 5.5 lb or a little above, which is why duty triggers like the ALG ACT sit around 6 lb.
Are binary triggers legal?
ATF has not treated them as machine guns, but several states ban them. Check your state's law before you buy one.
Do drop-in triggers fit every AR-15?
Most AR-15 lowers take small-pin (0.154 in) triggers. Check the pin size, and use anti-walk pins if the pins move.
