Quoted: Were the 601 bbls cut down?
I'm doing a supressed sniper clone. Looks like I may need a 605 bbl?
ETA: are those old supressors still available?
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The barrels were not cut down. The HEL slipped over the barrel and then threaded onto the existing barrel threads. Then the suppressor was marked concentric to the bore, holes were counterbored and threaded by the front sight base and screws were used to tension the suppressor while maintaining concentricity. An extra gas relief hole had to be added to the bolt carrier to handle the increased pressure.
Without the HEL, the M16 with the modified carrier would not work. Also, an HEL added to an unmodified M16 could result in potentially deadly failure.
The Sionics suppressor only required removal of the flash suppressor and could be used on any weapon.
The HELs were never on the NFA registry to my knowledge, except for samples possibly at Reed Knight's collection.
Sionic suppressors were commercially available and are still seen from time to time, but are inefficient compared to modern offerings. Had a guy offer me one that had a bunch of full-auto fired through it. He was asking $600. I passed.