Sig Sauer

SIG Sauer MPX K, Semi-Automatic Pistol, M-LOK, 4.5" Barrel, SIG Folding Brace, Timney Trigger - PMPX4B935

Sig Sauer SIG Sauer MPX K, Semi-Automatic Pistol, M-LOK, 4.5" Barrel, SIG Folding Brace, Timney Trigger - PMPX4B935
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This is a serialized firearm.

Sig Sauer

Overview

The SIG Sauer MPX K, Semi-Automatic Pistol, M-LOK, 4.5" Barrel, SIG Folding Brace, Timney Trigger - PMPX4B935 is a complete rifle. Compare prices from multiple merchants and find the best deal.

Specifications

MPNPMPX4B935
PlatformAR-9
Caliber9mm
Gas System LengthPistol
Thread PitchM13.5x1 LH
Action TypeSemi-Auto
Twist Rate1:10
ColorBlack
Barrel Length4.5
ComplianceStandard

Available Merchants(2)

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Brownells
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$2,200
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Sportsmans Outdoor Superstore
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$2,200
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Build history on GunPartPicker

Builders on GunPartPicker first added the SIG Sauer MPX K, Semi-Automatic Pistol, M-LOK, 4.5" Barrel, SIG Folding Brace, Timney Trigger - PMPX4B935 to a build in May 2026.

It was hard to find in August 2026, in stock on only 3 of the 19 days we checked, and today both retailers we track have it in stock. It dipped to $2,099.99 at Brownells for a stretch in August 2026, under its usual $2,199.99, so sales do come around. Buying today, the lowest price is $2,199.99 at Brownells.

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