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AR15.COM
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1/2/2012 5:05:15 PM EDT
If I am reading the FAQ correctly standard AR-15 triggers work. That means the small pin, non Colt, right? On Brownells they list a Timney for AR-15's and AR-308. Im here to learn, so what am I missing?
1/2/2012 5:25:00 PM EDT
[#1]
You have it right.  From what I understand, the RRA 2stg has been known for some issues in DPMS 308s due to the hammer dragging on the BCG.
You can also look on 308AR.com, they list compatability issues too.
1/2/2012 7:05:05 PM EDT
[#2]
AFAIK the Timney has a heavier hammer with the 308 version.  Takes a bit heavier strike than the average ar15 trigger group, although many groups will still work.  Better to be safe and inquire to the company you are looking to purchase your 308 trigger from.  And yes, small pin.
1/2/2012 7:35:44 PM EDT
[#3]
Quoted:
AFAIK the Timney has a heavier hammer with the 308 version.  Takes a bit heavier strike than the average ar15 trigger group, although many groups will still work.  Better to be safe and inquire to the company you are looking to purchase your 308 trigger from.  And yes, small pin.


I see it now. Thank you.

1/3/2012 6:40:01 AM EDT
[#4]
Quoted:
Quoted:
AFAIK the Timney has a heavier hammer with the 308 version.  Takes a bit heavier strike than the average ar15 trigger group, although many groups will still work.  Better to be safe and inquire to the company you are looking to purchase your 308 trigger from.  And yes, small pin.


I see it now. Thank you.



In some cases it may be just a heavier spring with the same hammer. If you get just the trigger and use the stock hammer and spring there is no difference. If you are talking about one of the drop in units that have both hammer and spring there will usually be an Ar15 and AR10/.308 version.
1/3/2012 10:27:17 AM EDT
[#5]
The new Rock River NM2S triggers do not have the high hammer that the older units had.  The new ones do not need any tweaking to keep them from binding on the bottom of the bolt carrier but even if you managed to get an old one, the tweak is so simple as to take only a couple of minutes with a knife sharpening stone.  You only need to remove .003 to .005 inch from the very highest point of the hammer when the hammer is in the cocked position.  You just run the stone parallel to the top of the lower receiver and lightly hone the highest most part of the trigger for a few licks and try again.  Two of my LRs needed honing with the old style triggers and the two LRs with the new style needed nothing done to them.
The standard springs on the trigger work just fine as they are, no tweaking needed.
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