The FN Browning Trombone is a pump-action long takedown rifle designed by John M. Browning in 1919.^[1] It was produced by FN Herstal, who made a total of 150,000 from 1922 to 1974.^[1] It was imported into the U.S. by Browning Arms.^[2] Models manufactured post 1969 had a product code W.

FN "Trombone"
FN "Trombone"
Type	Rifle
Place of origin	Belgium
Production history
Designer	John Browning
Designed	1919
Manufacturer	Fabrique Nationale d'Herstal
Produced	1922-1974
No. built	150,000
Variants	See text
Specifications
Mass	4.4 lb (2.0 kg)
Length	39+1⁄4 in (1,000 mm)
Barrel length	20 in (510 mm)
Caliber	.22 Short, .22 Long, .22 Long Rifle
Action	Pump-action
Feed system	11-round tubular magazine
Sights	dovetail front and elevation-adjustable rear

The stocks of early models were susceptible to cracking, sometimes attributed to the shape of the receiver; later models, such as the dovetail scope variant, appeared to solve this problem. The pump grip of all models is susceptible to cracking, the wood between the magazine and barrel being especially thin.