This thread will be for posting information on triggers that work. and the ones that don't work for 9mm AR.
It will become a searchable database for those needing 9mm AR trigger information.

I ask that posters keep information limited to a couple things.


What trigger you have that works.

What bolt you are using.

What lower and what upper you are using.

Then just let others know what triggers didn't work for you and include any other relevant info at the bottom of your post.
Like simple mods to make them better, etc.


Please guys....... add your specs ASAP so we can have a solid database of information that can be shared and searched to help others that are learning about the 9mm AR platform.

And it will also help guide others when they need to diagnose any on-going trigger issues.

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What I suggest is that you start will a std mil-spec trigger, as this will work with most bolts 99% of the time.
Then just move up to a better trigger once the gun operates 100%.

Same with buffers and springs...start simple, get it up and running, then begin to make the subtle changes to improve the baseline set-up.
My recommendation for carbines is a std carbine spring, the 5.4-5.5 oz buffer, and a buffer bumper.
Those three items together cost about $30-35 at midway/other online vendors.


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These are current combinations that are running solid for me....

Gun 1-

Trigger...POF 4.5lb drop-in
Bolt........Spinta blem
Lower.....PSD  Colt style mags
Upper.....NFA side-charger
Buffer.....AR Stoner brand 5.4oz
Std Carbine spring
NFA bumper




Gun 2-

Trigger.....POF 4.5lb drop-in
Bolt..........NFA non-modular
Lower.......NFA Glock mags
Upper.......NFA side-charger w/ LRBHO
Buffer.......AR stoner  9mm 5.4oz
std carbine spring
NFA bumper



Gun 3-

Trigger....PSA nickel boron coated mil-spec
Bolt.........Spinta blem
Lower......PSD colt style mags
Upper......NFA side-charger
Buffer......AR stoner 5.4oz 9mm
std carbine spring
NFA bumper


Gun 4-

Trigger....Delta team tactical 3.5lb drop-in
Bolt.........NFA modular
Lower.....NFA Glock mag
Upper.....NFA side-charger w/ LRBHO
buffer.....AR stoner 5.4oz 9mm
std carbine spring
NFA bumper

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The one trigger that didn't work very for me was the Rise Armament RA140.
The hammer isn't rounded, so it would hang up on the bolt ramp sometimes.

Hammer profile is something you need to take a look at before using with a 9mm bolt.
If it isn't rounded enough, it will have trouble resetting correctly.


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I'll include some links to previous trigger threads below.



Past AR 15 trigger thread

Past AR 15 trigger thread








.

I use a plain-jane milspec FA trigger group in my RR running an Olympic-pattern 9mm upper. Only issues I've ever encountered were with some milsurp sten mags, otherwise, it's just boringly reliable, in full or semi, with mostly cheap steel-cased 9mm (ulyanovsk, brown bear, silver bear). Lower wears a fixed stock and rifle buffer, so I've never had any of the carbine stock/buffer issues trying to tune it between 9mm and rifle caliber uppers.

ETA:
Trigger: mil-spec (colt)
Bolt: stock Olympic
Lower: Colt M16A1
Upper: stock Olympic

Trigger-mil spec (dsg)
Lower -PSA glock lower
Upper- matrix arms side charger
Bolt- spinta precision

Works great, havent had any issues

Just got my larue mbt in which I'll probably try out at some point.(busy at work)

I love this trigger, use it in my 5.56 rifles also.

Trigger.....POF 4.5lb drop-in
Bolt..........CMMG for 9 mm
Lower.......CMMG for Colt mags
Upper.......Bravo Company

Geissele SSA
Early RRA factory rifle. (Rifle came with unramped bolt and 9mm hammer.)
RRA ramped bolt circa 2015.

Trigger...Timney 3.5lb drop-in
Bolt........CMMG Mk9
Lower.....QC10 CLT9MM
Upper.....Rainier Arms Forged Mil-Spec Upper Minus FA 9mm / .22 LR
Buffer.....Heavy Buffers 9Q-T with standard carbine spring in Mil-Spec Carbine Receiver Extension

Flawless shooting with all ammo I have tired (HP, FMJ 115gr - 147gr)

Trigger....ALG ACT - purple springs
Bolt........CMMG 9mm
Lower.....Black Creek Precision
Upper.....Aero Precision Slick Side
Buffer.....Spikes ST-9x Buffer w/ standard carbine spring

Never had an issue with this trigger and set up


Does Not Work
Same setup with Velocity trigger - doubles and triples, had and OOB discharge resulted in squib, snapped bolt catch

Trigger.....POF 4.5lb drop-in
Bolt..........CMMG for 9 mm
Lower.......Black Creek
Upper.......Aero

New JP Bolt is a NO GO with the Larue MBT (at least for me)

Will fire first round...but won't reset.

Using a JP silent capture spring with standard weight configuration.

Pulled out the MBT and dropped in a standard mil-spec trigger....runs like a sewing machine.

PSA Colt pattern lower
Aero Precision upper
PSA G-9 Hybrid bolt
Blitzkrieg 9mm Hydraulic Buffer with JP AR-10 spring
Timney AR-15 Competion 3# single stage trigger

Trigger - Daniel Defense
Bolt - CMMG
Lower - PSA Colt
Upper - 7.5" PSA Slick Side
Buffer - 7.5oz
Spring - Carbine

works with either the PSA or NFA bolt

trigger.... OEM hammer with mass removed, and engagement notch re cut
bolt........ NFA modular ( I like the AR15 extractor)
upper..... PSA 16" with McDonald Precision EQ comp
lower..... NFA Glock billet
buffer.... A1  rifle length stock 5.2oz rifle buffer with rifle length spring

Built a few over the past year....

PSA upper....
PSA Hybred bolts
Anderson Lowers with Hahn mag adaptor
Metalform(colt) mags

The Hiperfire 24C works in all of them...no problems  2 1/2 pound triggers using the plain heavy springs==heavy springs gives the lightest trigger pull

I also use a JP trigger(JP speed hammer also)in my main PCC with a 2 1/2 pound trigger pull also. This works very well BUT.....I did tig weld a bump on the underneath side of the bolt to help reset the trigger.  Added .040 to the area under the bolt to help reset the trigger 100% of the time.  Found that I didn't need to add this "bump" when I used the Hiperfire 24C.

Very happy with this set up.

Trigger - Hiperfire EDT2 (4.5# Spring)
Bolt - Spinta Precision
Upper - CMT
Lower - CMMG dedicated 9mm / PSA Metalform mags
Buffer - Spikes ST-9X / Carbine spring

No issues, lights off any 115, 124, or 147gr ammo I have tried in it.

Trigger: Timney 3.5lb straight shoe
Bolt:  CMMG
Upper: Aero slick side
Lower: Qc10 colt 
8oz buffer
sprinco red
Now using BK hydraulic buffer with tubb .308.
No issues 100%

My buddy has same trigger and upper but with a Qc10 glock pattern lower and NFA bolt no issues either.

Edit for info

Trigger: POF drop in 3.5lb flat
Bolt: PSA hybrid G9
Upper: PSA
Lower: PSA Glock mag

0 issues

RRA 10.5" upper, ramped bolt by Adco.  ALG ACT trigger.  Ameetec lower. Prior to that I had a standard DPMS LPK with a round standard hammer.

Trigger: Giessele G2S in mine.

My set up

Upper: 16 in with Colt bolt ramped by Rudy aka Mad-Machinist (Macon Armory)
Lower: DDLES - Now QC10- Colt mag
Buffer: Spike ST-9X with standard carbine spring.

Been running flawlessly for over 4 yrs and about 4k rds without issues. Gun is dead nuts reliable and is like a laser.

Prior to this the gun was on a standard lower using a deciated Rock River Arms 9mm hammer. I've owned this 9mm upper since 1998 and believe it may have well over 20k rds thu it.

Angstadt Arms udp-9
Trigger - Triggertech adjustable set at 4lb pull   Works great!
Gibbz upper, Angstadt lower
16" Angstadt barrel
Angstadt bolt (looks just like a Sprinta)
Carbine buffer spring, spacer and 5.5 oz buffer

This set up does not work

Trigger: Elftmann Match - Curved
Bolt: Kaw Valley Precision
Upper: Anderson milspec and PSA milspec (keyhole and square forge, respectively
Lower: Black Creek Precision
Buffer: KAK Industries Heavy 9mm

Fails to reset about 50% of the time. I suspect if you used a regular buffer and quarters and allowed just a hair more bolt travel it would work.

Same setup works 100% with Geissele SSA-E and G2S triggers.

Damn, haven't heard that name in ages!


Gun 1
Runner Runner marked NFA Glock lower
Home milled billet upper
Faxon 4.5" barrel
Spinta blem bolt (weight removed for Law extension)
Standard carbine spring
Spike's st-9x 8.5oz buffer
Law folder
ALG ACT
Jp springs (yellow trigger/red hammer)

Gun 2
Runner Runner marked NFA Glock lower
Home milled billet upper
Faxon 8.5" barrel
Spinta bolt
Standard carbine spring
Spike's st-9x 8.5oz buffer
RRA varmint 2 stage trigger
Jp springs (yellow trigger/red hammer)

Both function 100% with all ammo I've tried, suppressed and unsuppressed

Spikes lower with KAK block
MAS Defense side charging upper
KVP bolt
Faxon 4.5" barrel
PSA 9mm buffer
Thordsen Customs keyed buffer tube

works with Tac-Con 3MR

DOES NOT work with Geissele SD3g

ALG QMS with older non-colored springs
RRA 9mm ramped bolt
Colt style mags with Hahn block
RRA 9mm upper
Hahn 8.6 oz buffer
Standard carbine spring

The same gun also worked great with:
RRA 9mm hammer
RRA 9mm unramped bolt

Works 100% with the old gray dryfilm C-Products mags but the new black painted C-Products mags are a headache, maybe 80% function and real hard to load more than 20 rounds.  I've shot 115gr up to 158gr, suppressed and unsuppressed.

7" and 10" 9mm SBR upper
RRA NM trigger
PSA bolt
5.4oz steel carbine buffer with bumper stock carbine spring
Macon Armory bottom load mag block with Metalform Colt style mags
135 Bayou coated handloads... 146 power factor out of my 16" PCC

Gun 1
Spikes Lower
Hahn Top loading block
ALG trigger
Toolcraft Bolt
Spikes ST-9x buffer
AR15part.com upper with Wilson barrel-16" barrel
Magpul MOE fixed stock

Gun 2
Black Creek Precision dedicated Lower
ALG Trigger
Colt Bolt
Spikes ST-9x buffer
AR15part.com upper with Wilson barrel-16" barrel
Magpul MOE fixed stock

Both guns run 100% and have never had any problems. I run ALG triggers in every AR I own.

Great thread

WHAT DIDN'T WORK:
Trigger...Geissele SSA-E and SSA
Bolt........KVP
Lower.....NFA 80% LRBHO Glock
Upper.....NFA Stripped LRBO Side Charger behind KVP Carbon Fiber Free Float Tube and 16" KVP 9mm Barrel
Buffer.....KVP 7.5 oz Buffer and AR9 buffer tube kit under magpul fixed moe carbine stock
Springs tried....KVP Extra Power 17-4 SS PCC Spring
                      standard carbine spring
                      spare standard carbine spring
                      AR-Pistol spring
                      Larue white carbine spring
                      Larue red hi power carbine spring

Neither trigger's hammer would reset.  Also tried removing weight from KVP BCG.  Then tried a standard carbine spring with a standard carbine 3oz buffer.  Still no dice.


WHAT WORKED:
Same as above, but with Hiperfire Hipertouch 24C Trigger.  Apparently it wasn't a 'timing issue' like I first thought...it was simply trigger compatibility.

Trigger...Hiperfire Hipertouch 24C @ 2.5# +/-
Bolt........KVP BCG
Lower.....NFA 80% LRBHO Glock
Upper.....NFA Stripped LRBO Side Charger behind KVP Carbon Fiber Free Float Tube and 16" KVP 9mm Barrel
Buffer.....KVP 7.5 oz Buffer and AR9 buffer tube kit under magpul fixed moe carbine stock
Spring....KVP Extra Power 17-4 SS PCC Spring

Ammo --- used X-Treme 135g Round Nose Flat Points......and had no issues feeding or ejecting the Flat Points with the KVP BCG & Barrel combo.

NEW:
I swapped the KVP 7.5 oz buffer and Extra Power spring for a Blitzkrieg Hydraulic Buffer and JP Tuned & Polished carbine spring.   Works!  Works better!  Able to get double taps much quicker with this set up.  Does it completely remove recoil and muzzle rise?  No.  But it does improve it considerably.  Is it worth $140?  Meh, if you want better, it's better, but at a cost.   It's not magic however.

PSA Glock lower
PSA 9mm buffer and spring
MagPul short safety
MagPul CTR
PSA 16" upper
Raptor CH
PSA bcg

Geissele Hi-speed NM - failed to reset
Timney Competition 3lb - reset every time so far

Anderson 223 lower
KAK bottom install 9mm adapter
JSE complete 9mm upper and bolt and carrier 16 inch stainless
Cut off rear miltary hammer
JP reduced trigger, hammer,
disconnector springs
KAK 8 OZ 9mm buffer standard carbine spring

Runs flawless with ASC modified plastic follower 20 and 32 round magazines

What did work, with the exception of bolt hold open

Spikes glock lower
Spinta bcg
Kaw valley 7.5 buffer
Carbine spring
ALG QMS
Aero upper 16" BA barrel

The same setup is a no go with Larue MBT. Trigger does not reset.

I am going to try a G2S or RRA NM as I'm a 2 stage guy on the ol ARs

Trigger...Trigger Tech Adjustable - set to 4 lbs.
Bolt........JP 9mm
Lower.....NFA/JoeBob
Upper.....NFA/JoeBob Side Charging Handle
Buffer.....JP 9mm
Barrel.....Ballistic Advantage 5.5" (soon to be Odin 7.5 due to rail clearance).

Ran about 250 rounds through it, not even one hiccup. Ran flawless. Barely any visible wear marks on the bolt. Trigger didn't have any issues either.

Last Round Hold Open works with original Glock 33 round, Glock 26 (12 round), and Magpul G19 (15 round).
One thing I did notice is now much dirtier the lower receiver gets compared to a regular AR. Guess it's the blowback action fouling the inside...

PSA Glock lower
All Kaw Valley Precision bcg 7.5oz buffer xp spring 8.5 barrel linear comp
POF 3.5lb flat trigger

This set up does not work with a CMC 3.5lb flat trigger

What works

Trigger....BCM PNT Trigger Assembly
Bolt.........CMMG Mk9 Bolt
Lower......Armalite SBR Lower with Hahn Dedicated Block
Upper......CMMG Mk9 PDW
Buffer......Kaw Precision 7.5oz Stainless Steel
Standard Carbine Spring

Shot about 300 rounds though it. Mostly 115 grain FMJ rounds (Winchester, Federal, Speer) and about 60 rounds of Winchester Ranger SXT 147 grain (RA9SXT). Used 20 round Metalform magazines with zero problems.

Now I have a Blitzkrieg Component Hydraulic Buffer, but haven't had a chance to shoot with it yet.

[Deleted]

What works

Trigger....ALG ACT Trigger Assembly with purple spring
Bolt.........PSA Bolt
Lower......PSA Lower with Hahn Dedicated Block
Upper......PSA
Buffer......Kaw Precision 10 oz Tungsten
KVP Extra Power recoil spring

   With the factory PSA trigger assembly the pull weight, after 2k+ rounds of use, was 6 pounds and smooth.  After the ALG trigger was installed the pull weight dropped to 3.75 pounds.  I may put the regular trigger spring in as that is a little lighter than what I was hoping to achieve.2
    Only able to fire 25 rounds after the install as a storm came up and the rain ran me off.  If something happens other than running fine I will update this post.

  Update.  I have 2 uppers for this lower with one being 10.5" and the other being 4.5".  They both work great.  The 4.5" upper uses a Spinta Precision bolt.  Still working perfectly both suppressed and not.

Which buffer spring did you go with?

QC10 Glock lower/upper
QC10 9mm bolt
MVG ARC stock
KAK 5.5 barrel
Rugged obsidian 45


Geissele SD3G- works flawlessly both suppressed/unsuppressed
* added a weld bead on the ramp bolt in order to guarantee trigger reset*

Runner Runner - NFA glock mag lower
NFA LRBHO upper
Faxon 8.5 barrel
KVP Bolt
KVP 7.5 Buffer
KVP heavy spring
Rock River 2 Stage Nation Match (DID NOT WORK RELIABLY)

Currently looking for a different trigger: RR 2 stage NM would not reset sometimes, which also led to a couple double fires....I was a little surprised when it doubled, and was leery that it would go "giggle" on me.

QC10 Lower
QC10 bolt
Larue MBT

Once in a blue moon it will double under rapid fire but I ran a match with it Wednesday night and it was flawless.  Damn near 1000 rounds on this setup now.

Trigger... Hiperfire ECL
Bolt........Spinta blem
Lower.....PSA GLOCK LRBO
Upper.....Andersen
Buffer.....9mm Hydraulic Buffer/Spring Combo - Pistol/SBR
Std Carbine spring
Magpul MOE SL-S

PSA complete upper and lower

Stock FCG parts kept

Replaced hammer and trigger springs for the KAW blue ones from joe bobs

Also added the JBs grip screw to adjust the trigger.

No problems at all.

I'm using a standard Stag Lower Parts Kit(GI Style Trigger)with a CMMG Complete upper, Rifle Gear Lower, RRA Mag Block and ASC Mag's. I did break a trigger pin, but it could have been a crappy pin. I have this  http://www.riflegear.com/p-610-kns-g...-diameter.aspx just in case it becomes a problem.

Greetings,

 Great idea OP, thanks!  

 For the data base:

 Trigger...Gieslee SSA/E (had also successfully used "G" SSA and RR National Match 2 stage for short time
periods). Vastly prefer the SSA/E, which has been in for 98% of the time. No functional issues with the others.
 Bolt........RockRiver, ramped and Glock mag cut by ADCO
 Lower.....Original DDLES small frame, Glock Mag type, with updated LRBHO hardware parts from QC-10  
 Upper.....Home brew; RR forging, YMH 16" barrel, Apex handguard
 Buffer.....Slash 9Q (recently replaced with old Endine Hydraulic for experimentation)
 Spring....Wolf Extra power carbine length

 The carbine worked just about perfectly since the initial build with the exception of the LRBHO which did not at all. Since the updated parts from QC-10 were installed, it's been virtually perfect. No issues at all regarding the FCG. The other two mentioned were short term attempts to help figure out some minor tuning issues, but worked just fine. The SSA/E is a really nice unit which I've also used in a few other (non 9mm) builds.

Keep up the good work!

Regards, Jim

BTTT for those that don't search for it.



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Hyper Fire 3 gun
RRA Upper and bolt
RRA Heavy Buffer
Hahn Top Load Block

3 malfunctions in the first mag, no malfunctions in the 470 rounds since.


PSA Glock mag lower (built by PSA using their standard AR15 LPK and 9mm buffer)
Spinta Bolt
Anderson no-FA upper

So... trigger is standard milspec AR-15.

Works really well.

Trigger............. Geissele rapid fire trigger, B-GRF, 2.5lb
Bolt.................. Kaw Valley
Lower.............. Joeboboutiftter Spartan Glock lower
Upper.............. Joeboboutiftter Spartan side charging upper with LRHBO
Buffer.............. Kyntec hydraulic, 4.2oz
buffer spring.... .308 carbine
NFA bumper

In this set up the rapid fire trigger works great.

PSA Colt Pattern Dedicated Lower
Aero Precision Slick Sided Upper (modified)
Faxon 16" 9mm barrel
Yankee Hill Machine flash hider
PSA G-9 Hybrid Bolt
Blitzkrieg Hydraulic Buffer
JP AR-10 buffer spring
Double Star Handguard (modified)
Sanders Armory Tactical Stock (modified)
Timney 3# trigger
C-More red dot
Metalform 20 round mag

Weighs 6.5 pounds (no mag).  Total build cost was $1240

I converted the upper to an active side charger.  I modified the Double Star handguard by adding more holes and slots.  I modified the Sanders Armory stock.

Shoots really soft.  Absolutely reliable.  My go to gun for Steel Challenge.

Jim Skeel

Keeping this info going !
Merry Christmas !!

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