Use and Maintenance of the ODL UTU2 45 Cal Pistol Suppressor
Overview
The UTU2 suppressor is a monolithic titanium suppressor designed with a Neilsen which allows it to be used
with most of the common John Browning tilting barrel designs including linked (1911) or cam operated (Glock)
pistols. The Neilsen is an assembly in the aft end of the suppressor that allows the gasses to push the suppressor
forward while allowing the unimpeded rearward movement of the barrel and slide assembly using a stainless
steel spring and titanium piston.
As such, the suppressor is able to function well with a wide range of ammo although it will perform best with
subsonic ammo.
Since the suppressor is a sealed unit ahead of the Neilsen, it is designed only for jacketed or plated ammo and is
not intended for use with cast lead projectiles that are not plated or jacketed.
The UTU2 45 Cal suppressor is designed to be run wet or dry and provide hearing safe sound levels at the ear
with ammunition tested. Initial sound testing was performed using a 10 shot average, recorded on a BK2209
with a 4136 mic 1.6M above short grass and 1m left of the muzzle along with chrono data. Dry numbers
averaged low 135.4 dB(A) at muzzle with an average speed of 826 FPS using 230 grain on an FNX 45. Sound
at the shooters right ear 133 dB(A) for a 27db noise reduction at the muzzle and at the ear.
Installation on the Pistol
First, ensure pistol is unloaded and lock the slide back.
Thread the suppressor onto the barrel ensuring that it
is not cross threaded. There should be no difficulty or resistance in the threading process. The pistol can be
tilted with the barrel up to make this process easier.
Tighten the suppressor very firmly by hand. Do not use a wrench to tighten the suppressor onto the pistol.
Once the suppressor is tight on the pistol, pull the suppressor firmly away from the pistol until the spring
compresses fully and rotate the suppressor until the top is parallel with the top of your pistol and release the
suppressor. It should return to the normal position and be even with the top of your pistol within 4 degrees.
The last 2 degrees can be obtained by rotating the suppressor one more tooth or slightly tighten the can further.
Test that suppressor is tight before every string of fire. If suppressor gets loose, baffle strikes can occur. Also,
test that the back nut is tight (you can use a spanner on this) after every 60 to 100 rounds.
The suppressor and pistol are now ready for use either dry or wet. Shoot the pistol as you normally would using
both eyes open to pick up the target with the weak eye while the strong eye picks up the front sight and aligns it
with the rear sight and the target. While the front sight is below the top of the suppressor, your dominant eye
will focus on the front sight while your weak eye will focus on the target allowing you to see what you need to
see to shoot fast and effectively.
The Neilsen on the suppressor returns the can to the ready position in approximately 2 milliseconds (.002
seconds) while the cycle time of the slide is approximately 48 milliseconds (.048 seconds). This allows normal
pickup of the front sight as the slide is returning to battery before the full recoil pulse is finished, allowing split
times suppressed as quick as unsuppressed.
