Here's what I did.
Step 1. Tap the grip screw all the way through, most lowers aren't, so a 1/4x28 tap does the job.
Step 2. Lighten up the hammer, simple deal, just grind off the tail of it.
Before.
After. Just use a lil black spray paint to cover the ground portion.
Step 3. $15 set of JP springs.
Step 4. This is the only part of the sear surfaces you touch. Before.
After. There has been no change to the geometry of the trigger, and no grinding, only taking down the machining marks.
My tool of choice for this is a ceramic knife sharpening stone. The surfaces are perfectly flat and it's such a fine grit that it feels smooth to the touch. It polishes, instead of grinding anything.
Step 5. Add a $0.15 1/4x28 set screw with some locktite.
Run it up the bore for the grip screw.
Hold the trigger to the rear and cock the hammer so that it is captured by the disconnecter (which was not touched and is factory correct) and advance the set screw until it contacts the trigger.
With the set screw contacting the trigger, release the trigger. Back out the set screw until the hammer falls from the disconnecter to the trigger.
Now, let the locktite set up, then function test it. Try it on safe to make sure the trigger can't be pulled. Try it on fire to make sure the trigger can be pulled. Cock the hammer, and with the selector on fire, ram the stock into the ground a few times as hard as you think the rifle can take (hint, it's a lot more than you think) to make sure the hammer doesn't fall.
Lube the FCG, and dry fire the crap outa it to make sure everything works. Revell in the amazing trigger you have created. Go to the range and shoot a thousand rounds or so just for kicks. Then shoot an AR with a stock factory trigger just to realise how much of an improvement you have made.
At no point is any geometry changed. At no point is the disconnecter altered which may lead to doubling. The result is a light, crisp, fast trigger that runs pretty damn good for a minimal investment.
If you do screw it up, throw it away, a FCG costs what? $50? Chump change when it comes to learning how to do something yourself, improving your own skills and understanding is priceless.















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