Tippmann is one of the oldest original brands still operating within the paintball industry. They manufacture a large portion of their product line within the United States, at least at the time of this writing.
Tippmann operates a machine shop located within their headquarters in Illinois, but there is little information pertaining to the items manufactured in-house versus outsourced to a different machine shop. Some of Tippmann's promotional videos show machining of various marker internals, but the extent of the production is unclear.
The below pictures were posted by an airsmith with the username Electrococker. The pictures are probably from the year 2000 or older, because they show some production of older markers that were discontinued around that time. The pictures were originally on film but were scanned before he posted, and I resized them +50% larger.
Above: Tippmann marker assembly
Above: Manual milling machine tools
Above: Marker bodies installed in a CNC rotary fixture (top and bottom). The CNC isn't visible in this picture.
Above: Two views of the Flatline test tunnel which extends through a portion of the building then leads outdoors.
Kamiya photos:
The below photos were originally posted by Paintball History (dot com) from the archives of Randy Kamiya. The photos are captioned "CNC machines at Tippmann". PaintballHistory writes: "possibly pictured in unknown issue of [Action Persuit Games]. From a folder of random images provided by APG.
Find more of Randy's photos at Paintball History Facebook Album
Videos:
Permalink: https://www.youtube.com/watch?v=GIDmmUB2vyc
Alternate link: Sciencechannel.com
Above: Aluminum casting process for a Tippmann X7 Phenom marker.
Permalink: https://www.youtube.com/watch?v=GIDmmUB2vyc
Above: Tippmann company video from 2014