Help with Unknown Magazine

[Mattrb]

Does anyone know what gun this magazine is for? I found it in some old storage from a late family friend.

No markings on it at all.

 

[BlackJackAce]

Looks like an aftermarket .303 British for a Lee-Enfield.

ProMag Enfield 4-Mk I .303 British 10-Round Magazine Blued Steel

Crafted of heat-treated blued steel, the ProMag® Enfield 4-MK I .303 British 10-Round Blued Steel Magazine is an affordable aftermarket rifle magazine, engineered to deliver exceptional reliability in any target-rich environment. This centerfire ri

gunmagwarehouse.com

 

[Mattrb]

Spot on, that looks like it!

Thank you!