Posted: 6/26/2009 9:16:19 PM EDT
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The stock trigger was pretty horrible. It was heavy, and gritty feeling. I polished the sear and trigger parts with a rubber dremel wheel (carefully) followed by MAAS metal polish while working the trigger repeatedly. I clipped the right hammer spring and bent the trigger springs 25*. Got the idea here: http://www.sargenthome.com/15_Minute_AR_Trigger_Job.htm The trigger is unbelievable. It is sooooooo much smoother and lighter now. Feels wonderful. |
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Quoted: tagged Oh also, I polished more than just the sear surfaces. I polished any areas of the trigger parts that would "contact" other metal. Like the part on the trigger that the pin goes through... the spring rides on that, so I polished the 'bearing' surfaces of that and the hammer. |
Lies and Heresy!!!!|
I have heard (perhaps gunstore lore) that there is a protective hardening on the AR-15 sear and hammer, that can be damaged by excessive polishing, so I have been leery to do more than use some very fine polishing compound (NO DEMEL).
However, that did not do much to make the trigger better (as you said, the standard is creepy, crudy, and heavy). I just bought several RRA two stage triggers, and like them very much. I have another two on order right now. |
I've polished pins and the sear engagement/hammer using JP Bore Paste. And I've also used these springs:
From Brownells at: http://www.brownells.com/.aspx/sid=18862/sku/AR-15_Spring_Kit The trigger pull is nice on the four rifles I have done. No problems with primer ignition. I did add one of these to a trigger: 
From Brownells at: http://www.brownells.com/.aspx/pid=307/Product/AR-15-M16_DROP-IN_TRIGGER_ADJUSTER It wasn't worth the effort or expense. ETA I also used oversized pins to tighten up the axis holes on the hammer and trigger. Taking the axis wobble makes for a much better trigger pull. 
From Brownells at: http://www.brownells.com/.aspx/pid=7589/Product/AR-15_ANTI-WALK_PINS IMO the most cost effective and more than just table top gunsmithing is using the spring kit, the pins, and polishing the trigger/hammer surfaces by putting the polish on those surfaces and using them about a hundred times. Doing that many times will insure proper engagement and not wearing past the surface hardening causing a much shorter trigger/hammer life which is easy to do with a Dremel. |