Head to head

Glock 43X MOS vs Springfield Hellcat Pro OSP

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

The biggest difference on paper is capacity: Glock lists a standard 10-round magazine for the G43X MOS, while Springfield ships the Hellcat Pro OSP with a 15-round and a 17-round magazine. The Hellcat Pro is also longer, taller and heavier. Figures are copied from each maker’s own page, checked November 5, 2026, and the two makers do not measure the same way (see the note under the table).

At a glance

Spec (maker label)	GLOCK 43X MOS	Hellcat Pro OSP 9mm
Caliber	9x19 mm	9mm
Capacity	Standard: 10; optional: none listed	(1) 15-Round, (1) 17-Round
Barrel	87 mm \| 3.41 inch	3.7" Hammer Forged Steel, Melonite® Finish, 1:10
Length	Length (overall): 165 mm \| 6.50 inch	6.6"
Height	Height incl. mag.: 128 mm \| 5.04 inch	4.8" w/ Flush Mag, 5.3" w/ Extended Mag
Width	Width (overall): 28 mm \| 1.10 inch Slide width: 22 mm \| 0.87 inch	Grip Width: 1"
Weight	Without magazine: 461 g \| 16.26 oz With empty magazine: 526 g \| 18.55 oz With loaded magazine: 651 g \| 22.96 oz	21 oz w/ Flush Mag, 21.4 oz w/ Extended Mag
Optic cut (maker wording)	“slide cuts designed for specific micro-optics”; Glock notes the G43X with MOS “does not come with adapter plates”	“a milled slide fitting the Springfield Micro™ footprint”
Source (checked Nov. 5, 2026)	us.glock.com G43X MOS	springfield-armory.com Hellcat Pro OSP

Like for like: Glock’s “Width (overall)” is the whole pistol; Springfield’s “Grip Width” is a grip figure, so the 1.10 inch and 1" are not the same measurement. Glock’s weight is printed without a magazine and with an empty magazine; Springfield’s 21 oz is “w/ Flush Mag,” and its page does not say whether that magazine is loaded. The closest pairing is Glock’s 18.55 oz (empty magazine) against Springfield’s 21 oz, which we have not verified is empty. Glock notes its technical data “are rounded and do not reflect tolerances.” Springfield’s page lists the Hellcat Pro in other variants; we compare the OSP model linked above. We list no price.

Which to pick (on paper)

If capacity is the deciding number: the Hellcat Pro OSP, shipping with a 15-round and a 17-round magazine, against the G43X MOS standard 10 (Glock lists no optional capacity).
If overall length and empty-magazine weight matter: the G43X MOS at 165 mm (6.50 inch) overall and 526 g (18.55 oz) with an empty magazine, against the Hellcat Pro OSP at 6.6" and 21 oz w/ flush mag.
If flush-magazine height is the deciding number: the Hellcat Pro OSP at 4.8" w/ flush mag against the G43X MOS at 128 mm (5.04 inch) height including magazine. (Springfield also lists 5.3" with the extended magazine.)
If barrel length is the deciding number: the Hellcat Pro at 3.7" against 87 mm (3.41 inch).
If a named optic footprint matters: Springfield names the Springfield Micro™ footprint; Glock’s page does not list footprints for the MOS cut, so we name none.

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

Frequently asked questions

How many rounds does the Glock 43X MOS hold compared with the Hellcat Pro OSP?

Glock lists a standard 10-round magazine for the G43X MOS and no optional capacity. Springfield lists the Hellcat Pro OSP with one 15-round and one 17-round magazine.

Which is longer, the G43X MOS or the Hellcat Pro OSP?

Glock lists 165 mm (6.50 inch) overall for the G43X MOS; Springfield lists 6.6 inches for the Hellcat Pro OSP.

Can I compare the grip widths directly?

Not exactly. Glock prints Width (overall) of 28 mm (1.10 inch) and Springfield prints Grip Width of 1 inch, which are different measurements.

Glock 43X MOS vs Springfield Hellcat Pro OSP

At a glance

Which to pick (on paper)

Frequently asked questions

Sources

Keep exploring

At a glance

Which to pick (on paper)

Frequently asked questions

Sources

Keep exploring

The Gun Release Report