You must be referring to pre-may sample AR10s.
I missed the glut. There are practically no original Transferable C&R Dutch AR10 MGs in private hands in the US. Knight's museum has a few dozen, and there are a few scattered in other government museums. Apart from a few amnesty guns, the majority of the C&R AR10s in the US saw no military service and have been gently treated since they left the factory. Knight does have a few that were rudely tested at Aberdeen.
Pre-may samples are another matter. Some 300 or so early AR10s came to the US in the early 1980s surplussed from the Guatemalan military training academy. The Guatemalan AR10s tended to have serial numbers in the the 003xxx range. These guns are very similar to the Sudanese variant except for the following details,
1) rear sight wheel has digits rather than arabic characters
2) no brass disc on the stock
3) flash-hider and bayonet shroud are ventilated with round holes.
The Guatemalan AR10s were offered as dealer samples and did not sell well. For this reason many of the Guats were rendered into parts sets and became either spare parts or kit built semis. The Guatemalan AR10s tended to be in good mechanical condition but had much handling wear. You can see several for sale right now on gunstoker. Search AR10 under the NFA section. Most of the AR10 MGs that pass through gunstoker are the pre-may Guats. Maybe once a year a Transferable converted semi-auto is sold (non C&R). This year two C&R Portuguese contract guns were offered, one from the Colt gun room.
Below is an original Cuban style Dutch AR10. Maybe there are 2-3 in the US outside of museums.
Below is a original transitional AR10 MG, pretty much like what was tested at Aberdeen. There are probably 3-4 in the US outside of museums. The Aberdeen guns had plastic forearms but wood was initially used because of resin development problems.
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