Anti rotation AR pins

Saltwater60

Saltwater60

.950 JDJ
Messages
31,321
Reaction score
35,035
Location
Western NY
Alright what do you guys like. I shot 20 rounds out of my 6.8SPC and on the 19th round I had to stop to put the trigger pin back in. It walked right out and I could even pull the trigger.
I’d rather not have one that needs reaming since the gun is together. Seems the prices vary greatly. I don’t need anything fancy just want to be safe and have the gun go boom every time. Thanks.
 
Podmonkey

Podmonkey

.577 Tyrannosaur.
U.S. Military
Messages
20,820
Reaction score
28,729
Location
Cambria co. PA
What kind of trigger do you have? This can be a problem with some of the cassette style drop in triggers that haven't a provision to keep the pins from walking out. Otherwise check on what @Calculon said. It's easy to install the spring legs incorrectly like that.
 
Saltwater60

Saltwater60

.950 JDJ
Messages
31,321
Reaction score
35,035
Location
Western NY
Podmonkey said:
What kind of trigger do you have? This can be a problem with some of the cassette style drop in triggers that haven't a provision to keep the pins from walking out. Otherwise check on what @Calculon said. It's easy to install the spring legs incorrectly like that.
Click to expand...
I have just a mil spec trigger that came with a LPK from S&W. No upgraded drop in one. One day I’ll get a better trigger. Built this for hunting. I assembled it and I’ll bet is missed placing the spring in the notches.
Thanks guys.
 
Podmonkey

Podmonkey

.577 Tyrannosaur.
U.S. Military
Messages
20,820
Reaction score
28,729
Location
Cambria co. PA
Saltwater60 said:
I have just a mil spec trigger that came with a LPK from S&W. No upgraded drop in one. One day I’ll get a better trigger. Built this for hunting. I assembled it and I’ll bet is missed placing the spring in the notches.
Thanks guys.
Click to expand...
Yeah, it goes in easier if the spring legs go under the pins instead of over them. Correctly installed there is considerable tension on those legs. AR triggers are not all that difficult to deal with but sometimes it feels like a 3 hands type of job.
 
Blimey

Blimey

.450/400 Nitro Ex
Messages
11,252
Reaction score
16,228
Location
Western NY
Not only does the right way decrease odds of light primer strike but also helps seat the trigger pin better.

RhlhD6z.jpg
 
Podmonkey

Podmonkey

.577 Tyrannosaur.
U.S. Military
Messages
20,820
Reaction score
28,729
Location
Cambria co. PA
mgr_b15.jpg

The tension of the hammer spring legs as it sits in the grooves of the trigger pin is what keeps it from walking out. That's why I generally prefer standard style triggers over the all in one drop ins. Some of the drop ins have anti walk provision also though.
 
Saltwater60

Saltwater60

.950 JDJ
Messages
31,321
Reaction score
35,035
Location
Western NY
I checked this morning and that’s how mine look. It’s hard to see, but the spring is definitely over the pin and it won’t catch in the grooves. It appears to be sitting in the grooves of the pin already but I can’t see. I moved the pin back and forth a few times and it doesn’t appear to catch. I think I’ll just get the anti rotation pins.
 
BDinPutnam

BDinPutnam

.475 A&M Magnum
Messages
14,492
Reaction score
20,850
Location
Someplace else
Saltwater60 said:
I checked this morning and that’s how mine look. It’s hard to see, but the spring is definitely over the pin and it won’t catch in the grooves. It appears to be sitting in the grooves of the pin already but I can’t see. I moved the pin back and forth a few times and it doesn’t appear to catch. I think I’ll just get the anti rotation pins.
Click to expand...

Not for nothing but they're not a whole lot of coin and they are damned easy to install.
 
Mosinitis

Mosinitis

.338 Win Mag
Messages
7,647
Reaction score
6,850
Location
NY state
This problem shouldn't be. You need to solve it. If you bypass it, it can show up in a different way. Something is wrong with your installation. Take it apart and reinstall taking care that every step is properly followed.
 
Mosinitis

Mosinitis

.338 Win Mag
Messages
7,647
Reaction score
6,850
Location
NY state
Anti-rotation pins are designed to stop pins from turning and give more consistent trigger pull (in theory). They are not meant as a solution for pins walking out of the receiver.
 
Podmonkey

Podmonkey

.577 Tyrannosaur.
U.S. Military
Messages
20,820
Reaction score
28,729
Location
Cambria co. PA
Saltwater60 said:
I checked this morning and that’s how mine look. It’s hard to see, but the spring is definitely over the pin and it won’t catch in the grooves. It appears to be sitting in the grooves of the pin already but I can’t see. I moved the pin back and forth a few times and it doesn’t appear to catch. I think I’ll just get the anti rotation pins.
Click to expand...
That is a a little bit odd honestly. Oh well, don't know what else to tell you.
 
Eddie Gunks

Eddie Gunks

.338 Win Mag
Messages
5,354
Reaction score
9,816
Location
Bangkok
Podmonkey said:
Well not just that but with the hammer spring on the correct way it the legs can still go under the trigger pin instead of over it. It easier to install this way.
Click to expand...

Why are you suggesting to assemble them in the wrong way?

Assemble your firearm correctly. Do not use incorrect suggestions from the internet.

Installing it correctly is very easy to do. I dont understand the issue b
 
Eddie Gunks

Eddie Gunks

.338 Win Mag
Messages
5,354
Reaction score
9,816
Location
Bangkok
Podmonkey said:
View attachment 50090

The tension of the hammer spring legs as it sits in the grooves of the trigger pin is what keeps it from walking out. That's why I generally prefer standard style triggers over the all in one drop ins. Some of the drop ins have anti walk provision also though.
Click to expand...

These pictures appear to be the correct way to install them.

I am
Not sure what you are talking about “under”. Anyway. Do it correctly.

OP: It could be the pin grooves are slightly out of spec.

KNS. Makes good stuff.

I dont like anti rotation pins only cause if you need to service your trigger you must have those tiny allen keys. Usually you do not have them when you need them. (I do have them on one rifle and i like them )
 
Podmonkey

Podmonkey

.577 Tyrannosaur.
U.S. Military
Messages
20,820
Reaction score
28,729
Location
Cambria co. PA
Eddie Gunks said:
These pictures appear to be the correct way to install them.

I am
Not sure what you are talking about “under”. Anyway. Do it correctly.

OP: It could be the pin grooves are slightly out of spec.

KNS. Makes good stuff.

I dont like anti rotation pins only cause if you need to service your trigger you must have those tiny allen keys. Usually you do not have them when you need them. (I do have them on one rifle and i like them )
Click to expand...
Haven't you ever mistakenly put the spring legs resting on the bottom of the receiver shelf instead of atop the trigger pin? It will still work like that but you get a lot less tension on the hammer spring that way.
I try to keep things as simple as possible with my guns.
 
Saltwater60

Saltwater60

.950 JDJ
Messages
31,321
Reaction score
35,035
Location
Western NY
Hammer spring is definitely on top of the pin. I just checked it this morning.
I will pull it apart tomorrow. I’m not saying I didn’t make a mistake with the install, but I took my time and checked it while doing it. I did have a bit of trouble getting it together, but I took my time and triple checked it while doing it.
Here’s a video from midway and this is what I did. Only thing I can think of is maybe I put the pin in backwards. It said to do it non-grooves side first right to left I think. I’ll check that. That’s the only thing I can think of. I can see the groove and it looks to line up with the spring arms when moving the pin back and forth but it does catch at all. No resistance at all. Maybe the pins are out of spec. I’ll check it though because I want to be sure.
 
Last edited:
Eddie Gunks

Eddie Gunks

.338 Win Mag
Messages
5,354
Reaction score
9,816
Location
Bangkok
Saltwater60 said:
Only thing I can think of is maybe I put the pin in backwards.
Click to expand...

For your own edification, the only tome it is crucial to put the pins in “correctly “ (left to right etc) is on a select fire/burst lower. Cause they hold in yhe pins around the burst apparatus. Sorry. I am a few beers into my night and cant think of the official names.
 
Mosinitis

Mosinitis

.338 Win Mag
Messages
7,647
Reaction score
6,850
Location
NY state
Whenever you assemble the springs the rule of thumb is that tension is increasing when the spring is winding up and tension is released when the spring is unwinding. You could have caught your mistake if you followed that rule.
 
Saltwater60

Saltwater60

.950 JDJ
Messages
31,321
Reaction score
35,035
Location
Western NY
GOYABEAN said:
Scratch that your doing the milling :slap:
Click to expand...
I only said that because instead of me using a drill press or a router he has an actual industrial mill, lathe, and metal working shop in his garage. He’s a working engineer, but yes scratch that I will be standing there doing it myself with a lot of guidance from him.
 
GOYABEAN

GOYABEAN

.950 JDJ
Messages
32,301
Reaction score
67,001
Location
Land of Freedom PA
Saltwater60 said:
I’m only having him do it because instead of me using a drill press or a router he has an actual industrial mill, lathe, and metal working shop in his garage. He’s a working engineer, but yes scratch that I will be standing there doing it myself.
Click to expand...
Have you seen the 5D tactical jig seems like a nice and easy to use system :D
 
You must log in or register to reply here.
Top