May have answered my own question with a Google search:
Marlin (Glenfield) 36G
Notes: Not to be confused with the Model 36 above, the Model 36G was basically a simplified Model 336 marketed under the Glenfield brand name instead of the Marlin name. They typically had stocks of inexpensive birch and round 20-inch standard-weight barrels. The rear sight was an adjustable spring-leaf and elevator type. The Model 36G was only built from 1964-66, but by this time 5930 had been built.
Variants included the Model 30, built from 1966-72, and the replacement for the Model 36G. It was basically the same rifle except for the checkering on pistol grip wrist and fore-end (this checkering included decorative designs of a stag’s head and oak leaves from 1969). Some 80,000 of these carbines were built, an impressive amount in six years. The Model 30 is identical to the Model 36G for game purposes. The Model 30A replaced the Model 30 in 1973, and was built until 1983. It was basically the same weapon as the Model 30, but had a full-length tubular magazine. The same checkering as the Model 30 was used at first, but the decorative designs were dropped in 1982. By the time production ceased, about 300,000 Model 30As had been built. The Model 30GT was built from 1979-80; it was a Model 30A with a shorter 18.5-inch barrel, a straight wrist, and a squared operating lever. The Model 30AS began production in 1983 and is still being built; it is identical to the Model 30A, but has a crossbolt safety, and is identical to the Model 30A for game purposes. The Model 30AS brought was sold under the Marlin name, unlike the others.