Head to head

FN 509 Midsize vs Glock 19 Gen5

By Cole Harlan, EditorUpdated Nov 5, 2026How we verifyEditorial standards

The biggest printed difference is weight: FN lists 26.5 oz for the 509 Midsize without saying whether a magazine is in it, while Glock lists 21.52 oz without a magazine and 23.63 oz with an empty one for the G19 Gen5. Barrels are close on paper (FN 4.0″, Glock 4.02 inch). Every figure is copied from each maker’s own product page, checked November 5, 2026.

At a glance

Spec (maker label)	FN 509 Midsize	GLOCK 19 Gen5
Caliber	9mm	9x19 mm
Operation	Double-action	Not yet verified (Glock lists “System: Safe Action®”)
Magazine capacity	10 or 15 Rd.	Standard: 15; optional 15 / 17 / 24 / 31 / 33
Barrel length	4.0″	102 mm \| 4.02 inch
Overall length	7.4″	185 mm \| 7.28 inch
Height	5.2″	128 mm \| 5.04 inch (Height incl. Mag.)
Width	1.35″	34 mm \| 1.34 inch (Width, Overall)
Weight	26.5 oz. (magazine state not stated)	Without magazine: 610 g \| 21.52 oz; empty magazine: 670 g \| 23.63 oz; loaded magazine: 855 g \| 30.16 oz
Trigger pull	5.5 - 7.7 lb.	26 N
Sight measure	Sight Radius: 5.79″	Line of Sight (Polymer): 153 mm \| 6.02 inch
Rifling twist	1:10″ RH	Not yet verified
Optic	Not yet verified (the Midsize page we read prints no optic-cut line)	Not yet verified
Source (checked Nov. 5, 2026)	fnamerica.com FN 509 Midsize	us.glock.com G19 Gen5

Like for like: FN prints one weight, 26.5 oz., and does not say whether it is with or without a magazine, so we do not line it up against either Glock figure and we do not subtract. Glock’s height is “incl. Mag.”; FN prints “Height” with no definition. Trigger pull is in different units (pounds as a range for FN, newtons for Glock) and we do not convert. FN’s “Sight Radius” and Glock’s “Line of Sight” are each the maker’s own measure and may not be the same distance. Glock notes its technical data “are rounded and do not reflect tolerances.” FN prints a list price on its page; we list none.

Which to pick (on paper)

If you want the lighter printed weight: Glock lists 21.52 oz without a magazine and 23.63 oz with an empty one. FN lists 26.5 oz with no magazine state, so the two are not a clean pair.
If you want a longer printed sight measure: FN lists a 5.79″ sight radius; Glock lists a 6.02 inch line of sight (polymer). They may not be the same measurement.
If you want a 10-round option named on the spec line: FN lists “10 or 15 Rd.” and says it ships with two 15-round or two 10-round magazines. Glock lists a standard 15 with optional 15 / 17 / 24 / 31 / 33.
If you care about trigger pull wording: FN prints a 5.5 - 7.7 lb. range and calls the operation double-action; Glock prints 26 N. We have not converted or tested either.
If you plan to mount a red dot: neither page we read states an optic cut for these models. Check the exact SKU with the maker before you buy a plate or optic.

We have not range-tested these; facts below are from the makers.

Not yet verified

Whether the FN 509 Midsize weight is with or without a magazine, and whether its height includes the magazine.
Any optic-ready wording for the FN 509 Midsize (the page we read prints none in its specs) and for the Glock page we used.
Prices are not shown.

Frequently asked questions

What barrel length does the FN 509 Midsize have?

FN lists a 4.0 in barrel for the 509 Midsize. Glock lists 102 mm (4.02 inch) for the G19 Gen5.

How much does the FN 509 Midsize weigh?

FN lists 26.5 oz. and does not say whether a magazine is included. Glock lists 21.52 oz without a magazine and 23.63 oz with an empty magazine for the G19 Gen5.

What magazine capacities does the FN 509 Midsize list?

FN lists 10 or 15 rounds for the 509 Midsize. Glock lists a standard 15 with optional 15 / 17 / 24 / 31 / 33 for the G19 Gen5.

FN 509 Midsize vs Glock 19 Gen5

At a glance

Which to pick (on paper)

Not yet verified

Frequently asked questions

Sources

Keep exploring

At a glance

Which to pick (on paper)

Not yet verified

Frequently asked questions

Sources

Keep exploring

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