Unfortunately for consumers, the industry has not standardized on the length of a 2-inch nail. Some are 50 mm (just under 2 inches) and some are 51 mm (just over 2 inches).
Some nail guns listed as "up to 2 inches" are made to accept 51 mm nails, others accept up to 50 mm. For example, my WEN 61720 nail gun will NOT accept these Porter Cable 2 inch nails (but it WILL accept 50mm nails, such as Bostitch).
Suggestion: before buying nails for your gun,
1) take note of your gun's gauge size (and get only that type)
2) take note of your gun's maximum nail length IN METRIC (mm) and get that length (or less)
Porter Cable makes decent nails that are widely available (e.g. Home Depot carries them too), but they would do their customers a favor if they made them 50mm so they would fit ALL nail guns. Porter-Cable BN18125-1 1-1/4-Inch 18 Gauge Brad Nail (1000 per Box)'
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