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If you have a way to measure the trigger pull, then that would be the easiest. Also look at your trigger return spring and see if it has square wire (heavy) or round wire (light). the firing pin block spring would have to be removed to look and see which one it is.
 

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I'm unfamiliar with a model called USP9f. You mean USP9?

Light LEM has not been available in the USP other than special order, or via an "armorer" modification. Trigger weight of standard LEM is 9+ pounds. Trigger weight of Light LEM is roughly 5 pounds. Only way to tell is weigh the trigger.

No digital trigger gauge? Use a milk jug.

Get a gallon milk jug full of water, a coat hanger, and an EMPTY pistol. Cock the pistol (cycle the slide). Hook the coat hanger to the milk jug and hook it over the trigger. Muzzle up and GENTLY lift the jug off the table. You've got 8 pounds of water there (8.34 to be specific) plus the weight of the plastic jug. If the pistol didn't dry fire you have Standard (AKA Heavy) LEM for sure (or didn't cock the pistol).

If the pistol dry fired decrease the amount of water and try again. A pint of water (16 fluid ounces) weighs a pound. My Light LEM USP9C trigger weighs 5.3 pounds.

-- Chuck
 

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I'm unfamiliar with a model called USP9f. You mean USP9?

Light LEM has not been available in the USP other than special order, or via an "armorer" modification. Trigger weight of standard LEM is 9+ pounds. Trigger weight of Light LEM is roughly 5 pounds. Only way to tell is weigh the trigger.

No digital trigger gauge? Use a milk jug.

Get a gallon milk jug full of water, a coat hanger, and an EMPTY pistol. Cock the pistol (cycle the slide). Hook the coat hanger to the milk jug and hook it over the trigger. Muzzle up and GENTLY lift the jug off the table. You've got 8 pounds of water there (8.34 to be specific) plus the weight of the plastic jug. If the pistol didn't dry fire you have Standard (AKA Heavy) LEM for sure (or didn't cock the pistol).

If the pistol dry fired decrease the amount of water and try again. A pint of water (16 fluid ounces) weighs a pound. My Light LEM USP9C trigger weighs 5.3 pounds.

-- Chuck
Dude. That's a good idea. Thanks.
 
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