This is a Birchwood Casey Pen known as the BPP, model BC-15111.
Since 1948" serious shooters" avid collectors and professional gunsmiths have relied on Birchwood Casey for shooting and gun care products that have stood the test of time. Birchwood Casey has pioneered innovative products with an unwavering dedication for quality.
Features:
Fills in Scratches or Worn Areas
Fast-Drying
Non-Permanent