As the name implies, this device was designed and engineered specifically to reduce visual and sound signature. The SRM is placed in line after the BPR.   The SRM can be built to achieve whatever signature level reduction is necessary. Generically speaking for a standard M4, an SRM 4 will bring the decibel level well below ear safe. As with all OSS modular components, it is for the operator to decide which components offer the greatest advantage for each mission or operational environment.
The size of the SRM is determined by the mission-specific signature reduction requirements ranging in length from 2.3 to 5 inches.

As with the BPR, each SRM is caliber convertible and can be used with your BPR on multiple weapon platforms.  This capability also allows for the use of all types of training ammunition.

Summary
Designed specifically to reduce visual and audio signature
Exception decibel reduction
Built as per operator preference, minimum recommended is SRM™3. Largest available is SRM 6
Proprietary Thread Attachment
Self tightening
Multi caliber convertible
End user serviceable
100 percent sustainable
SRM component is included with every BPR1 to complete the suppressor system.
THIS COMPONENT IS CONSIDERED NFA. SRM'S PURCHASED INDIVIDUALLY ARE SUBJECT TO SERIAL # AND TAX.

Weapon System Overall Length Increase
Unit Length Behind/In Front of The Flash Hider
Unit Weight in Front of the Muzzle with the BPR1
Total Unit Weight
Point of Impact Shift from 32 F to 600 F (0 C to 315 C)
Peak Visual Signature Including 1st Round
Avg Decible Level Cold (Under 200F/93C)
Avg Decible Level Hot (Over 400F/205C)
Avg Decible Level Hot (Sustained Auto Fire)
Bolt Velocity/Rate of Fire Increase%
Mirage Intensity Reduction on line of Sight
Automatic Fire Capable
Caliber Convertible
Maintenance Sustainment Rate – 20 RPM
Maintenance Sustainment Rate – 60 RPM
Maintenance Sustainment Rate – 850 RPM (3-5 Round Burst)

SRM 4
4.2 in / 10.67 cm*
4.2 in / 10.67 cm*
11.3 oz / .32 kg*
8.7 oz / .25 kg
Less than .5 MOA / .14 Mil
Less than 3.0 Lux
138 db*
139 db*
142 db*
Less than 6%
60%
Yes
Yes
Lifetime of the barrel
Lifetime of the barrel
Lifetime of the barrel