FN build BAR's, as in m1918,
they were know as model 1930 and model D.
They were improved by Dieudonné Saive, who helped develop the bhp and developed the fn49 and fal.
I recently held a NIB(stock condition) FA fn build colombian BAR in 8 mm, that was sold right from under my nose, together with an original mp43 (bether known under its name stg 44)
Yes 5 minutes can make a lot of a difference.
interesting link:
http://www.forgottenweapons.com/light-machine-guns/fn-model-d-bar/
from wikipedia:
Belgium[edit]
A variant known as the FN Mle 1930 was developed in 7.65×53mm Belgian Mauser by FN Herstal and adopted by the Belgian Army. The Mle 1930 is basically a licensed copy of the Colt Automatic Machine Rifle, Model 1925 (R 75).[25] The Mle 1930 had a different gas valve and a mechanical rate-reducing fire control mechanism designed by Dieudonne Saive, housed in the trigger guard/pistol grip housing.[25] Some of these FN rate reducer mechanisms and pistol grip housings were later purchased by Springfield Armory for evaluation and possible adoption on a replacement for the M1918.[17] The weapon also had a hinged shoulder plate and was adapted for use on a tripod mount. In 1932, Belgium adopted a new version of the FN Mle 1930 allocated the service designation FN Mle D (D—Demontable or "removable") which had a quick-change barrel, shoulder rest and a simplified take-down method for eased cleaning and maintenance. The Mle D was produced even after World War II in versions adapted for .30-06 Springfield and NATO-standard 7.62×51mm ammunition.
The final variant in Belgian service was the Model DA1 chambered for the 7.62×51mm NATO cartridge and feeding from the 20-round magazines for the FN FAL rifle.