Pirate Arms M4SS Polymer Foldable Rear Sight Black

The Pirate Arms M4SS Polymer Foldable Rear Sight Black is a compact and lightweight flip-up rear sight for M4 and AR-platform replicas fitted with a 20mm Picatinny rail. Designed as a reliable backup sight when using a red dot sight or scope, this rear sight provides a quick and direct aiming solution when optics are not available.

The M4SS design complements modern M4 builds and low-profile rail setups perfectly.

Materials and fastenings

The Pirate Arms M4SS Polymer Foldable Rear Sight Black is made from durable polymer, ensuring it is lightweight without placing unnecessary strain on your rail. The material is impact-resistant and suitable for intensive use during training sessions and skirmishes.

It mounts easily onto a standard 20mm Picatinny rail. When folded down, the sight remains compact and out of the way of optics or other accessories.

Usage and compatibility

This rear sight is designed for M4-type replicas and other platforms featuring a Picatinny rail system. Thanks to its flip-up mechanism, the sight is ready for use immediately when you switch from optics to mechanical sights.

When paired with a matching front sight, this rear sight forms a fully mechanical sighting system for emergency situations or minimalist builds.

Key features

• Folding rear sight
• Compatible with 20mm Picatinny rail
• Lightweight polymer construction
• M4SS design
• Compact, low-profile design
• Black finish
• Ideal as a backup sight

Safety and recommendations

After fitting, always check that the sight is securely fastened to the rail. Align the front and rear sights correctly for optimum accuracy. Checking the fastening regularly prevents any play during use.

Why choose the Pirate Arms M4SS Polymer Foldable Rear Sight Black?

The Pirate Arms M4SS Polymer Foldable Rear Sight Black offers a lightweight, functional and reliable backup sighting solution for any M4 or AR setup. Practical, compact and ready for use whenever needed.

Frequently Asked Questions

Does this sight fit any rail?
Yes, it is compatible with standard 20mm Picatinny rails.

Can I use this with a red dot sight?
Yes, it’s ideal as a backup when using optics.

Is this suitable for M4 replicas?
Yes, it is designed for the M4 and similar AR platforms.

With the Pirate Arms M4SS Polymer Foldable Rear Sight Black, you can add a compact and reliable backup sight to your M4 platform.