SIG's SG 553 (5.56x45mm) and SG 553-R (7.62x39mm) assault rifle, with a modern flat top upper receiver.

An updated version to the SG 552, the SG 553 by SIG Sauer AG is a carbine (or commando) length assault rifle part of the 550 series of Swiss made SIG rifles. Besides the change in charging handle design, the upgrade from the 552 to 553 re-positioned the recoil spring from the back of the receiver to wrap around the piston rod, which helped with improving reliability issues.

*Please note that proportions may not be 100% correct. This model isn't made for 3D printing, it's a low poly asset made for use in games. *I would recommend you to download and use the Blender files provided, so you can add and remove attachments to your own accord. Otherwise, preset attachment loadout is available in FBX files.

Attachments: B&T Picatinny Rail adapters, SIG Cheek Riser, B&T Picatinny Rail Handguard.

Features:

• x1 SG 553 Assault Rifle 5.56x45mm
• x1 SG 553-R Assault Rifle 7.62x39mm
• x2 Magazines (30 Rounds: SIG Mag and AK PMAG)
• x2 Barrel lengths (SB, LB variants)
• x1 Cheek Riser
• x2 Picatinny Rail handguard adapters for classic handguard
• x1 B&T Picatinny Rail handguard

Skins:

• Receiver: Black, Grey
• Furniture: Black, OD Green

Model Information:

• Model: FBX and OBJ formats
• Normal Map: DirectX and OpenGL (both included)
• Materials: 4K PBR (AO, Albedo, Roughness, Metalness, Normal Map). PNG format 16 bits.
• SG 553: 4 Assigned Materials on 1 UV map each: (sg553_accessories, sg55x_mag_30rnd, sg553_receiver, sg553_furniture, sg553_b&t_handguard)
• SG 553-R: 5 Assigned Materials on 1 UV map each: (sg553_accessories, ak_pmag_gen3, sg553r_receiver, sg553_furniture, sg553_b&t_handguard)
• Rigged on a skeleton for animating (FBX, Blend file)
• Unrigged version available in OBJ format
• Mesh parts separated
• Blender files included. (ver 2.79+), (ver 3.6+)

Changelog:

• 24th Feb 2026: Added SG 553-R models and materials, Added B&T Picatinny Rail Handguard (55,394 tris altogether).
• 26th Feb 2026: Fixes to the SG 553 AO material, now theres no shadow from classic handguard. Fixes to SG 553-R Gas Block on normal map.
• 28th Feb 2026: Fixed SG 553-R selector serrations.
• 16th Mar 2026: Modified the classic furniture lower handguard to make the stock clipper protrude. Furniture materials also updated. Models and Blender files updated.