BSA, Lee Enfield "Long Tom", .303, Mag Cap.10 #3425

 Long Tom long range sights, Single Shot selector block, metal dust cover on bolt, metal work reasonable

More info from AI;

The phrase "BSA Long Tom" typically refers to the highly collectible firearms manufactured by the Birmingham Small Arms Company (BSA): [1, 2]

1. The .303 Magazine Lee-Enfield (MLE) Military Rifle

Historically, "Long Tom" was the widespread British and Commonwealth nickname for the Magazine Lee-Enfield (MLE)Â and its predecessor, the Magazine Lee-Metford (MLM). [1]

• The Name: It was called the "Long Tom" due to its extended 49.5-inch overall length and 30.2-inch barrel. This distinguished it from the much shorter 44.5-inch Short Magazine Lee-Enfield (SMLE) that replaced it in the early 1900s. [1, 2]

BSA’s Role:Â BSA was a primary manufacturer of these rifles for the British Empire. Famous batches include the 1901-dated MLE Mk I* rifles issued during the Second Boer War and later used by Rifle Clubs and Home Guards across Australia and New Zealand. [1, 2, 3]