Umarex Umarex Notos Exploded Diagram for Porting and Trigger job

#40 (poppet seat) 39 i think is the barrel sleeve isolator

Airgun Al said:

The Notos is very quiet.
Im courious how much louder it gets, after simply porting.
Is there a noticable difference?

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You'd be increasing the max flow rate of the porting, thus increasing pressure behind the pellet and down the barrel, resulting in more energy. Yes it would be noticeable to someone with good hearing, the younger the person the more noticeable (hearing worsens as we age, regardless of damage).

-Matt