Try Marlin
I have a 7000T which I purchased 3 years ago. It is a 7000 with heavy bull barrel, travel adjustable trigger, laminated stock with accessory rail on forearm, and an adjustable butt plate for length extension, and to raise and lower the stock.
The rifle cost me about 2 1/2 times more than the current 7000. I think you could contact Marlin and get parts that would allow upgrade of your gun.
Bull Barrel #107419
Trigger Guard Complete #507358
Trigger Stop #407058 (might be included above)
Stock #407938
Adj. Plate #104118
Adj. Tube #104852
Buttplate #404102
(ask for all the various screws required to put this all together)
Slide Rail #207131
2 Slide Rail Screws #330790
Swivel Base and Loop #404011 & 404012
I have an 8-32 x 44 w/adj parallex scope and can drive golf balls out at 125 yards with no problem. On the indoor range at 25 yds - 50+ shots in a row into the bullseye.
This has probably been one of my best firearm purchases. Works like a darn, accurate as hell, and looks pretty hot.
Hope this helps!