Description
Thin-walled synthetic stocks are notorious for not giving a threaded base enough material to grab, and that's exactly the problem this piece solves. The GrovTec Hollow Stock Push-Button Base gives you a clean, compact attachment point on hollow or thin-walled rifle and shotgun stocks where a standard thread-in base just won't hold. Instead of relying on stock thickness, it's secured from the inside with a mating panel nut, so you get a solid anchor even on a stock that feels like it's mostly air behind the shell.
What Makes the GTHM198 Base Different
This is a full-rotation design, meaning your swivel spins freely and your sling can find its natural hang without fighting the mount. It's machined from stainless steel with a black oxide finish on the push-button components, giving you a low-glare look that blends in and holds up against the elements. The base accepts any GrovTec push-button swivel, so if you already run their QD slings on another rifle, you can move between guns without swapping hardware.
Installing the Hollow Stock Push-Button Base
Installation is straightforward for anyone comfortable with a drill. The typical process is drilling a half-inch hole in the stock, then either tapping it 9/16-18 or letting the panel nut clamp everything down from the inside. A little thread locker and a wrench on the QD barrel gets it seated tight, and folks who've done it report the finished result looks factory. GrovTec also makes a dedicated installation tool if you want more control over seating depth.
A popular use is converting an older A2-style or wood-hollow stock over to modern QD slings, and it plays nicely with common QD sling brands. Made in the USA and backed by GrovTec's reputation for sling hardware, this base is a smart pickup if you want QD capability on a stock that otherwise couldn't support it.
Key Specifications
- Manufacturer: GrovTec
- Manufacturer Part Number: GTHM198
- Model Number: GTHM198
- UPC: 811071011983
- Product Type: Push-Button Swivel Base / Adaptor
- Material: Stainless Steel
- Finish: Black Oxide
- Rotation: Full Rotation
- Intended Use: Hollow / thin-walled rifle and shotgun stocks
- Compatibility: Accepts any GrovTec push-button swivel
- Retention: Mating panel nut secured from inside the stock
- Thread: 9/16-18
- Country of Origin: Made in USA
What’s Included
- GrovTec Hollow Stock Push-Button Base (GTHM198)
- Mating panel nut
- Installation instructions
Frequently Asked Questions
How is the hollow stock push-button base held in place?
Rather than depending on stock thickness like a standard threaded base, this one is retained by a mating panel nut on the inside of the stock. That clamping action gives it a solid anchor even in thin-walled synthetic or hollow stocks. Many users add a bit of thread locker to keep it from backing out over time.
Does the GTHM198 base come with a push-button swivel?
No, the swivel is sold separately. This is the base only, along with the panel nut needed to secure it. The good news is it accepts any GrovTec push-button swivel, so you can pair it with a QD sling you already own.
What's involved in installing this base?
You'll drill a half-inch hole in the stock, then either tap it 9/16-18 or let the panel nut clamp it down from the inside. A drill, a wrench, and some thread locker cover most installs, and GrovTec offers a dedicated installation tool for better control over seating depth. It's a common project for converting older or hollow stocks over to modern QD slings.
Will this work on both rifle and shotgun stocks?
Yes, it's designed for hollow or thin-walled rifle and shotgun stocks in both synthetic and wood. As long as there's room to drill the hole and reach the inside to fit the panel nut, it will work. It's a popular choice for A2-style stocks and other setups where a standard thread base can't get enough bite.





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