Disassembly and Cleaning
The Neilsen should be cleaned and lubed after every 500 rounds and no more than 1000 rounds. Since the
Neilsen is a moving part, proper maintenance will ensure optimum operation of the host pistol.
Remove the aft nut with a 20mm spanner using a counter clockwise direction (standard right hand thread
removal – lefty loosey). Remove the spring and clean off excess carbon with a brush and carbon remover.
With the nut off, inspect the O-ring inside the nut. It is a 16x1.5 mm Viton O-ring that reduces the amount of
gas that escapes past the piston. If it looks smooth and has no ragged edges hanging off, it is good to go for
another cycle.
Remove the piston by pulling straight out . With the piston free of the suppressor, spray a carbon cleaner on the
piston and brush off all carbon with a brush. Make sure you run the bore brush and cleaner down the bore of
the piston to remove all carbon. Brush off excess carbon with any type of mild cleaner and a toothbrush Simple
Green is recommended.
Neilsen disassembled.
Use a sharp dental pick or die file to scrape the hard carbon deposits that foul the indexing ridges in the
aft portion of the suppressor where the piston slides.
This is the most important area to clean as the carbon
in the ridges can impede the movement of the piston. If you have compressed air, blow out any residue from
the suppressor while using safety glasses or just wipe dry or let it drain out.
