AR15.Com Archives
 Geissele Trigger on a Colt
nlhassler  [Member]
7/22/2011 6:29:09 PM EST
I will start by saying that I know absolutely nothing about the assemblies of an AR-15. I am new to the long rifle world and have been reading these forums for several months now and trying to learn some things. So my disclaimer is that this might be a completely ridiculous question.

I have a Colt LE 6940 and thinking about upgrading the trigger. I thought I had read somewhere on these forums that colt had put smaller trigger pins in their trigger assembly. Is this true? If so, does this make it to where I cannot upgrade the trigger?

I am in law enforcement and looking to upgrade my trigger. Does anyone have any specific recommendations as far as triggers go?

Thanks!
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danc46  [Team Member]
7/22/2011 6:56:08 PM EST
Colts have two types of axis pins in receivers. One will be the standard .154" the other will be .170". You want the small pin Colt in .154". That is the standard size for military parts in military M16s.
And there are some Colts out there with sear blocks in them where a DIAS (drop in automatic sear) cannot be installed.
Those types of Colt receivers make some target triggers impossible to install.
Projektile  [Team Member]
7/22/2011 6:56:59 PM EST
Colt HAS changed their trigger pins, but they have been changed to be the standard sized ones. Previously they were using larger, non-standard pins. You're G2G buying a trigger with the standard size pins.

Aso, congrats on owning a 6940. I love my 6920.
45FMJoe  [Team Member]
7/22/2011 6:58:56 PM EST
The smaller pins are just "mil-spec" sized .155" pins. Everyone else says they are .154", Colt says .155" and since Colt was the company to field the very first AR-15 I will defer to their knowledge. Anyway, for years Colt used .170" pins in civilian guns as a way to avoid lawsuits against them for people using M16 FCGs. They have since reverted to .155" pins in all their civilian rifles. In short, yes all the Giessele triggers will fit your Colt.
KILLERB6  [Team Member]
7/22/2011 6:59:10 PM EST
My $0.02 worth:

1. While nice triggers are nice, you won't really see any difference in a typical AR unless you are target shooting at relatively long range.
2, Remember that the Geiselles (except for the 3G Comp) are 2-stage triggers; some people don't like 2-stage triggers.
3. The Geiselle SSA is pretty much the standard upgraded battle rifle trigger.
4. The smaller pin size is standard; larger pins are non-standard.
phey_05  [Member]
7/23/2011 4:52:07 PM EST
Hi,

sorry OT
where can we buy this jig for testing geissele triggers?

[youtube]http://www.youtube.com/watch?v=sRq5W8SUbu8[/youtube]

Thanks
danc46  [Team Member]
7/23/2011 5:35:20 PM EST
Originally Posted By phey_05:
Hi,

sorry OT
where can we buy this jig for testing geissele triggers?

http://www.youtube.com/watch?v=sRq5W8SUbu8

Thanks


Not the same one but a place to start looking:

http://www.brownells.com/.aspx/sid=44126/pid=19958/Product/AR_15_Hammer_Trigger_Jig_w_Dry_Fire_Block?utm_medium=shoppingengine&utm_source=googlebase&mc_id=10000&gdftrk=gdfV21820_a_7c187_a_7c745_a_7c080000070_d_080000070_d_11444
WholeBunches  [Member]
7/24/2011 2:54:41 AM EST
When I went to order my SSA trigger for my Colt LE lower, I figured it must now use the smaller pins since it's a newer Colt, after all, that's what folks say, but I measured the trigger and hammer pins anyway. Surprise: They were the larger size, so that's the SSA trigger assembly I had to order (and it fit just fine). So, you need to measure the pins before ordering. .154" or close uses the small pin assembly; .169-.170" uses the large size. Just tap one of the pins just a little so it sticks out the receiver enough to measure it before ordering. I was within seconds of hitting the "send" button to complete my order when I had second thoughts and measured the pins in my Colt lower.

BTW, I love my SSA trigger. Much easier to make longer shots and even for plinking. Originally my trigger pull was 8 1/2 pounds. Now 3 1/2 pounds 1st stage, and 1 1/4 pounds second stage (all measured with a digital trigger pull gage and averaged for 5 shots). For quicker shooting, you can simply pull the trigger without waiting/feeling the 2 stages.
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