SIG SAUER P365 Nitron Micro-Compact vs Smith & Wesson M&P 9 Shield Plus

Both are 9x19mm Parabellum micro-compact records in this directory. The M&P 9 Shield Plus is 8 mm / 0.3 in longer overall; its barrel is 0.26 mm longer; the M&P 9 Shield Plus lists 3 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	8 mm / 0.3 in (M&P 9 Shield Plus is greater)
Overall width	Not published by both
Overall height	Not comparable — P365 Nitron Micro-Compact: magazine state not stated by SIG SAUER; M&P 9 Shield Plus: no basis stated
Barrel length	0.26 mm (M&P 9 Shield Plus is greater)Note: the published inch figures are identical, so this difference does not resolve in that unit.
Weight	Not comparable — P365 Nitron Micro-Compact: magazine state not stated by SIG SAUER; M&P 9 Shield Plus: Smith & Wesson states no magazine basis; it publishes magazine weights separately, as 2.6 oz for the 13-round and 2.2 oz for the 10-round
Standard capacity	3 rounds (M&P 9 Shield Plus 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.

Size, to scale

SIG SAUER P365 Nitron Micro-CompactLength 147 mm / 5.8 in
Smith & Wesson M&P 9 Shield PlusLength 155 mm / 6.1 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 (P365 Nitron Micro-Compact: magazine state not stated by SIG SAUER; M&P 9 Shield Plus: no basis stated). Widths are not drawn because M&P 9 Shield Plus publishes no overall width.

Published fields, side by side

Field	P365 Nitron Micro-Compact	M&P 9 Shield Plus
Manufacturer	SIG SAUER	Smith & Wesson
Manufacturer size label	Micro-Compact	Micro-Compact
Directory frame class	Micro-compact	Micro-compact
Chambering	9x19mm Parabellum	9x19mm Parabellum
Overall dimensions	147 × 27 × 109 mm / 5.8 × 1.06 × 4.3 in (height: magazine state not stated by SIG SAUER)	length 155, height 117 mm / length 6.1, height 4.6 in (width not published)
Barrel length	78.74 mm / 3.1 in	79 mm / 3.1 in
Weight	504.6 g / 17.8 oz (magazine state not stated by SIG SAUER)	507.5 g / 17.9 oz (Smith & Wesson states no magazine basis; it publishes magazine weights separately, as 2.6 oz for the 13-round and 2.2 oz for the 10-round)
Standard capacity	10 rounds	13 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.