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I found the value of a Marlin/Glenfield (similar serial) to be at about $2,700. I'm looking too, but that's the price I was able to find.
Your Glenfield Model 30GT is basically a Marlin 336 with a straight stock. If you go to Marlin firearms website you can download the manual there. Your 30GT was only made in 1979 and 1980 then discontinued. The T stood for Texan the G either Glenfield or Grand depending on who you talk to. Based on the 21 in the serial number (oldguns.net) your 30GT and mine were made in 1979. They were not as poular due to the difference in the stock design and only 7,737 were ever made. About $250 is a close estimate on value. They are excellent shooter, just not collectible even though rare.
i have a glenfield model 30 gt ser# 21041263 i would year made and some history about it thk dalton
The 30GT was the Glenfield variation of the 336 Texan. Should have the straight stock. Your gun was made in 1979. Value, depending on condition, would be $250-$300. sales@countrygunsmith.net You can try to see if this manual here would work for parts breakdown (see page 13 and 14) - http://www.marlinfirearms.com/pdfs/manuals/MFC_Centerfire.pdf
The short answer is the 30 GT was only made in 1979 and 1980. I understand the straight stock was unpopular vs the curved one that they discontinued it in 1980 after less than 8000 units were made. The 1980 version should have an inlay of the state of Texas. (GT stood for Grand Texan) I own a 1979 version that is only about 200 units older than yours.
Marlin firearms decided in 1964 to establish a line of inexpensive rifles to be sold at outlet stores for less money than the regular Marlin line of rifles. They were made under the Glenfield name. They used Beach-wood instead of Walnut, the checkering was pressed on not carved into the wood. The models were 36G, 30, 30A, 30GT, and 30AS. they stopped making them in 1983. You may have one that was sold in 1987 but was made in 83. Also if you check, I'll bet you find the name Glenfield on the left side of the rifle barrel. These rifles are not in demand to a collector but are very serviceable. The value is roughly as follows: Brand new in box $150, Good $90, Poor $50.