Springfield Armory Hellcat 3" Micro-Compact vs Springfield Armory Hellcat Pro OSP

Springfield Armory publishes both as Hellcat models. Both are chambered in 9x19mm Parabellum. The Hellcat Pro OSP is ≈15.2 mm / ≈0.6 in longer overall; its barrel is ≈17.8 mm / ≈0.7 in longer; the Hellcat Pro OSP lists 4 rounds more of standard capacity. 2 fields are not comparable — overall height, weight — because the makers publish them on different measurement bases.

Computed differences06

Field	Difference
Overall length	≈15.2 mm / ≈0.6 in (Hellcat Pro OSP is greater)
Overall width	Not published by both
Overall height	Not comparable — Hellcat 3" Micro-Compact: with flush magazine; 4.5 in with the extended magazine; Hellcat Pro OSP: with flush magazine; 5.3 in with the extended magazine
Barrel length	≈17.8 mm / ≈0.7 in (Hellcat Pro OSP is greater)
Weight	Not comparable — Hellcat 3" Micro-Compact: with flush magazine, which Springfield does not state is empty; 18.6 oz with the extended magazine; Hellcat Pro OSP: with flush magazine, which Springfield does not state is empty; 21.4 oz with the extended magazine
Standard capacity	4 rounds (Hellcat Pro OSP is greater)

How these differences are computed: each is the arithmetic difference between the two published figures, and it is only shown where both sources measured the field the same way. Where a source states a measurement basis the other does not match, the row says so instead of subtracting — figures on different bases are not comparable even when the numbers sit side by side. Differences marked ≈ involve at least one figure this directory converted between unit systems, so the difference is no more precise than that conversion.

Size, to scale

Springfield Armory Hellcat 3" Micro-CompactLength ≈152.4 mm / 6 in
Springfield Armory Hellcat Pro OSPLength ≈167.6 mm / 6.6 in

Boxes, not silhouettes: makers publish a pistol's overall envelope, not its shape, so that is all this draws. Every box is aligned at the rear and drawn at one fixed scale, the same on every page of this site, so drawings compare across pages. It is not life-size on your screen. Heights are not drawn because the heights are not published on one stated basis (Hellcat 3" Micro-Compact: with flush magazine; 4.5 in with the extended magazine; Hellcat Pro OSP: with flush magazine; 5.3 in with the extended magazine). Widths are not drawn because Hellcat 3" Micro-Compact and Hellcat Pro OSP publish no overall width.

Published fields, side by side

Field	Hellcat 3" Micro-Compact	Hellcat Pro OSP
Manufacturer	Springfield Armory	Springfield Armory
Manufacturer size label	Micro-Compact	Not published
Directory frame class	Micro-compact	Not published
Chambering	9x19mm Parabellum	9x19mm Parabellum
Overall dimensions	≈length 152.4, height 101.6 mm / length 6, height 4 in (height: with flush magazine; 4.5 in with the extended magazine; width not published)	≈length 167.6, height 121.9 mm / length 6.6, height 4.8 in (height: with flush magazine; 5.3 in with the extended magazine; width not published)
Barrel length	≈76.2 mm / 3 in	≈94 mm / 3.7 in
Weight	≈519 g / 18.3 oz (with flush magazine, which Springfield does not state is empty; 18.6 oz with the extended magazine)	≈595 g / 21 oz (with flush magazine, which Springfield does not state is empty; 21.4 oz with the extended magazine)
Standard capacity	11 rounds	15 rounds
Verification	Source verified 2026-08-12	Source verified 2026-08-13

Reference information only. Not legal, purchasing, training, carry, storage, or assembly advice. Manufacturer technical data are rounded and may change without notice. Spotted an error? Submit a correction.