Primary Weapons 4G2BTPB-1F Castle Nut 7075 T-6 Aluminum

This Primary Weapons Systems 4G2BTPB-1F component pairs a machined buffer tube design with a PWS ratchet lock castle nut and end plate set. Constructed from 7075 T-6 aluminum and finished to MIL-A-8625 F, Type III, Class 2 standards, it is built to be lightweight while maintaining structural integrity. The tube features an extended carrier support lip, lightening cuts, and a unique fluted design to assist with debris clearing and smoother cycling. The kit is specified for Mil‑Spec tube diameter use and ships with the ratchet lock castle nut and end plate included.

Key Specifications

• The weight is 4.3 oz.
• Constructed from 7075 T-6 aluminum.
• The finish is MIL-A-8625 F, Type III, Class 2 anodized.
• Designed for Mil‑Spec tube diameter compatibility.
• Includes PWS ratchet lock castle nut and end plate set.
• Features an extended carrier support lip for smoother cycling.
• Incorporates lightening cuts that reduce weight by approximately 1 oz versus standard Mil‑Spec tubing.
• Utilizes a unique fluted tube design intended to assist in debris clearing.
• Manufacturing method includes impact extrusion for consistent tube dimensions.

With a focus on durable materials, controlled weight savings, and practical design features like the extended carrier support lip and fluted tube, this PWS component is a straightforward upgrade for builds that use Mil‑Spec tube diameter parts. The Type III anodized finish and inclusion of the ratchet lock castle nut and end plate offer a ready-to-install package for users prioritizing long-term durability and dependable fitment in compatible assemblies.