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- tailstock offset
- TAVOR SAR (IWI bullpup rifle)
- The Science of Gunnery (book)
- Thomas Frank Baughman
- throat
- timeline, gun/gunsmithing related events
- timeline, GLOCK
- trajectory
- trench gun (Winchester shotgun)
- trigger
- trigger, double-action
- trigger, release
- trigger, set
- trigger, single-action
- trigger, two-stage
- Trijicon, Inc.
- try-gun