SA80 History: XL70 Series Final Prototypes (Individual Weapon and LSW)

Published on May 13, 2017
Duration: 20:30

This entry details the final prototype stages of the British SA80 rifle, focusing on the XL70 series. It highlights significant reliability issues encountered during trials, stemming from design flaws and cost-cutting measures. Expert analysis from Ian McCollum underscores the impact of political pressure on the weapon's development and eventual production quality.

Quick Summary

The SA80 XL70 series represented the final prototype stage of the SA80 development, but faced significant reliability issues. Design flaws like brass shaving from bolt lugs and unreliable aluminum magazines, coupled with cost-cutting measures leading to receiver twisting, plagued the prototypes. Data manipulation was used to meet trial goals, highlighting the impact of political pressure.

Chapters

  1. 00:00Introduction to the XL70 Series
  2. 01:45Reliability Trials and Data Manipulation
  3. 05:03Mechanical Design Flaws
  4. 09:20Cost-Cutting and Quality Degradation
  5. 11:43XL70 E3 Rifle Features
  6. 14:41XL73 E2 LSW and the 'Split Group' Problem
  7. 17:19Disassembly and Internal Changes

Frequently Asked Questions

What were the main reliability issues with the SA80 XL70 prototypes?

The SA80 XL70 prototypes struggled significantly with reliability, failing to meet trial targets of 2,500 MRBF. Issues included brass shaving from bolt lugs jamming the action, breaking firing pins due to misaligned holes, and unreliable aluminum magazines.

How did political pressure affect the SA80 development?

Political pressure to reduce costs and meet deadlines led to the use of lower-quality materials and simplified manufacturing. This resulted in receivers that could twist under hand pressure, causing bolt jams and degrading overall reliability compared to earlier prototypes.

What design lineage influenced the SA80?

The SA80's internal design, particularly the bolt and recoil assembly, was fundamentally based on the AR-18 action. This included an evolution from an AR-18 style dual-rod system to a more robust triple-rod configuration in later prototypes.

What were the specific problems with the XL73 E2 LSW?

The XL73 E2 Light Support Weapon (LSW) version suffered from 'split groups' during full-auto fire, where subsequent rounds impacted high and to the left of the initial shot. A 'girder' extension was added to stabilize the barrel, though it was largely a compromise.

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