S Series SL7i-BL


Calibres Info compatibility chart
S series SL7i-BL .30

all .30 non-magnum
S series SL7i-BL .300/.338
.300 Win Mag,
.338 Lapua Mag
(Depending on thread type)  
S series SL7-BL .30 530-550 g UPDATED!
S series SL7-BL .300/.338 640-660 g UPDATED!
Diameter 45 mm
Overall length of
176-181 mm
Added length to weapon 131 mm
Net sound suppresssion  
(1m left of the muzzle, .308 Win)
(shooters ear, .308 Win)
31-33 dB(A)
27-30 dB(A)
(1m left of the muzzle,
.338 Lapua Mag)
(shooters ear, .338 Lapua Mag)
25+ dB (A)
34+ dB (A)
Warranty 2 years


The Ase Utra S series SL7i-BL is a fast attaching suppressor intented for bolt action hunting, target and sniper rifles from 7.62 mm NATO up to.338 Lapua Mag.

The recommendation for only bolt action is due to our introduction of the SL5i-BL 7.62 Low Pressure suppressor, being a recommended model for semi/select fire rifles.

The S series SL7i-BL suppressors are mounted with a Ase Utra BoreLock flash hider mount or muzzle brake mount.

Manufactured in Finland by Ase Utra Oy, the SL7i-BL suppressors are manufactured with a combination of black steel and 300 series stainless steel and are assembled by welding.*

Various BoreLock muzzle brake mounts are available, to adapt the suppressor to a multitude of weapons, without permanent modifications to them.

» BoreLock combatibility chart

Suppressor and flash hider / muzzle brake product code chart

* The BoreLock mount interface is black steel and the body of the suppressors is 300 series stainless steel.


The S series SL7i-BL suppressors reduce the sound pressure level of a 7.62 mm NATO calibre rifle by c. 31-33 dB (A) ( 1m left of the muzzle ).

The S series SL7i-BL suppressors also reduce recoil and muzzle flash significantly.

CalibreSuppressor model
S series
SL5i .223
S series
SL5i .25
S series
SL5i .30
SL5i 8mm S series
SL6i .338/9.3
S series
SL6i .375
S series
SL7i .30
SL7i 8mm S series
SL7i .338
204 Ruger o          
222 Rem o          
223 Rem o          
22-250 Rem o          
243 Win no o     o  
260 Rem no o     o  
7MM-08 Rem no no      
308 Win no no o o   o o
338 Federal no no no no o no no
25-06 Rem no o     o  
6.5X55 SE no o     o  
270 Win no no      
7X64 no no      
30-06 Sprg no no o o   o o
8x57 IS no no no no
9.3X62 no no no no o no no
9.3X66 SAKO no no no no o no no
7 mm Rem Mag no no no no o   no no o
300 Win Mag no no no no o   no no o
338 Win Mag no no no no o no no
.338 Lapua Mag no no no no o o no no
.375 H&H Mag no no no no no no no no
- Recommended
o - Reasonable to use*
no - Do not use
    - Can be used**
* Suppressors can be used on these calibres, however the bullet channel is oversized compared to the calibre, possibly affecting suppressor performance. Also the suppressor may be too short, when compared to the power of the calibre.
** Safe to shoot, however the difference between the suppressor bullet channel and calibre is quite excessive and clearly affecting the suppressor performance.

» See the compatibility chart of all suppressor models