Yes, the PPL is a unique looking model of the Sterling Arms Co. Gasport & Lockport, NY. I have a model 302S which my dad carried for years that I was just able to secure an additional magazine for. It's ammo picky and seems to only digest 22 Stingers. I recently saw a model 400S and it's a rather normal looking 380 which if I recall correctly was double action. Looking at the 8th edition Balderson guide they made numerous semi-auto's and a 22 cal. singleshot takedown "Backpacker" rifle. Sterling Arms Corp. & Sterling Revolvers appear to have been in business 70+ years prior.