Here are some non standard internals I took out of a VerbeekOlater pump I rebuilt last year. The bolt is longer than a Bushmaster or Spirit pump to compensate for the extended breech which disassembles.
Tony Verbeek’s “VerbeekOlater” was produced in limited numbers for Sudden Death out of Southern California. Tony, his cousin Randy Christophe and his brother Ron Verbeek assembled this paintgun at Sigma Precision in 1988.
In 1988, Sudden Death competed with this paintgun in the 1988 National Survival Games Championship, but freezing temperatures and a small RPS paintball did not match well with the VerbeekOlater’s large inner diameter barrel (and they didn’t make backup smaller barrels. After this tournament Sudden Death switched to Sheridan paintguns.
This nelson based pump paintgun later evolved into the Rebline. The Rebline uses the same extended bolt and this internal set would likely be compatible directly with the Rebline.