Sometimes you eat the bar and sometimes the bar eats you.
It looks like it could be for the Unique, carbine/pistol unit that was marketed by Firearms International back in 60s.
Thanks for the help someone helped me ID it correct , its for an HK 270 which I did indeed own at one point back in the 80's sold it over 20 years ago. I am taking this as a lesson to label things so I know what they are ...
Sometimes you eat the bar and sometimes the bar eats you.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |