Trigger Issue

demonsmokr

demonsmokr

Sergeant
Full Member
Minuteman
Aug 15, 2009
179
1
40
The Lone Star State
#1
First off I should say what Ive done with my rifle. I bought a complete upper direct from Armalite. A4 model, 20" barrel, typical nothing special. I first bought an Iron Ridge Arms with the trigger in the group buy last year. I decided to set it aside and wait for the uppers to come out, so I took the trigger out and bought an Armalite stripped lower direct from them. I have put about 90 rds or so in 2 different trips to the range. First time was 50rds, no problems what so ever. Today how ever, I went to the range, shot one full 20rd mag, and started shooting my full 25rd mag, about half way through it double tapped on me and I had noticed my lower trigger pin had backed out about 1/8 inch. I immediately ceased fire and all that. I am still an AR noob, but I can see the lower pin does not fill the hole all the way. The story of alot of men Im sure, but when I let the trigger down, I can easy push pin out with my finger. What is wrong with my gun? And what options do I have to prevent this from ever happening again?
 
#2
Re: Trigger Issue

Call KNS Precision up and get their Anti-Rotational trigger pin set,if you order through the site it will cost you $8 more than just calling them.Nice guy and you will get them in about 3 days.My personal preference is the "Solid Bar" style rather than the "Dogbone" Style.Easy to install and you will never go back to the standard pins IMO.
 
#5
Re: Trigger Issue

Did you check to see if the legs of the hammer spring are resting on the trigger pin? One side of the trigger pin should have groove cut in it about 1/8" from the end. This is where the leg of the hammer spring should be resting on and preventing the trigger spring from walking. The hammer pin should it's groove machined in the center. If the legs of the hammer spring are resting on the bottom of the receiver, or if the pins are in the reverse location, then you'll have problems with the pins walking out of position.
 
#6
Re: Trigger Issue

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Badshot308</div><div class="ubbcode-body">Did you check to see if the legs of the hammer spring are resting on the trigger pin? One side of the trigger pin should have groove cut in it about 1/8" from the end. This is where the leg of the hammer spring should be resting on and preventing the trigger spring from walking. The hammer pin should it's groove machined in the center. If the legs of the hammer spring are resting on the bottom of the receiver, or if the pins are in the reverse location, then you'll have problems with the pins walking out of position. </div></div>

This is probably it. I'd bet that the hammer spring legs are under the trigger pin instead of resting on top.
 
#7
Re: Trigger Issue

Actually, after checking. My pins have no grooves. The pin looks small and is not fill the hole properly. If I release the trigger, I can push the pin and pull it out with my fingers. My concern is where did these pins come from, I had bought an Armalite lower parts kit with a standard trigger, and I ordered the lower with trigger direct from IRA, and had a smith do the swap. I had someone tell me the trigger pins are all standard except for Colt. Its been almost 10months since I had the work done at SOG Armory, so I doubt they would stand behind their work after this long. The spring is resting on top of the pin, they have not fallen. So I guess thats good. I didnt get a chance to call KNS, does anyone know if their anti walk pins will work for the AR-10?
 
#8
Re: Trigger Issue

If you have the Iron Ridge G2 trigger, it says right on the website that their pins are .155. The KNS are .154, same thing. If the .223 receiver is narrower than .308 you'd be concerned with the length of the pins.

Brain fart: I had my Geissele with .154 pins in a RRA AR15 lower before moving it to Armalite EA AR10 lower. Pins are the same length.
 
#9
Re: Trigger Issue

Im not talking about length, Im talking about diameter. The pin seems too skinny. Length is fine, its just not filling the hole, as in its loose like a hot dog in a hallway. I kinda figured the pins would work, since most of the lower parts will. Im gonna call and make sure tomorrow.
 
#10
Re: Trigger Issue

Do you have a way of measuring the hole diameter in your lower such as a pin gauge set? Do you have a way of measuring your current pins with a micrometer or dial caliper? Just for reference, the pins on my AR10 measure .154". If your pins don't have the appropriate grooves, then they're not the right ones.
 
#11
Re: Trigger Issue

No I dont have any kind of tools like that yet. Im gonna take it back to SOG Armory this week and see what kind of shit they feed me. Being in Texas, you would think I would be able to find more gunsmiths, but I also live in Houston. The most democratic city in Texas. We have a lesbian mayor. A city in Texas with a lesbian mayor. I believe my state is losing its integrity. Anyways, I have no way of getting an exact measurement. I only have tape measures. I read the pins are the same for the AR15 and AR10. I will find out what SOG Armory will do tomorrow.
 
#12
#13
Re: Trigger Issue

Are there cheaply made pins out there that dont come up to spec? Im thinking the smith I went to is to blame. They did also sell me the wrong spring when I bought my stock and stuff for the lower. Im going to another smith this weekend hopefully. It just has to be a shitty pin the smith put it in, Im thinking he took all my parts off, maybe lost a pin and slapped one it from a bin and didnt check it out. Im just gonna get the anti walk pins and be done with it.
 
#14
Re: Trigger Issue

If the pins have no grooves and have a sloppy fit, they probably aren't even AR-15/AR-10 trigger pins in the first place. You can get the anti-walk pins if you like, but the proper Armalite ones are only $1.25 a piece. Might want to find a better smith in your area as well.
 
#15
Re: Trigger Issue

Thats what Im thinking. I had shot the rifle before with the IRA lower and trigger, no problems, shot great. Then got SOG Armory to swap all the lower parts back in April and just got out over the weekend. I want to actually hunt this season, so I need the kinks worked out. I just want to anti walk pins to reduce the chance of this happening again as much as possible. If the KNS pins will work, Ill cough up the 40$ for them.
 
#16
Re: Trigger Issue

Why on Earth do you need a smith to deal with this issue. Do a little research find a few pics and figure it out for yourself. This is NOT rocket science.

If you can change your oil, you can build an AR.
 
#17
Re: Trigger Issue

I dont have any tools to do it myself. I probably could do it, Im just wanting to find a good smith I can trust to do other stuff. If I cant trust a smith to install an LPK correctly, its not a good idea to use him for anything else is it? So for the time being, I dont mind using a smith utnil I build my tool set. You gotta start somewhere.
 
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