Ned Ludd
Silver $$ Contributor
The effect on POI is most likely due to muzzle blast from the MS bayonet flat sensor deck. Many experiments were done by early users to confirm this, but the most telling one was that the change in POI would move from side to side as the bayonet (sensor deck) was rotated from side to side.
Anything that minimizes the muzzle blast will help minimize the shift in POI, such as increasing distance of the sensor deck from the muzzle blast, the use of a muzzle brake, which diverts some amount of the blast off to the side, the use of lighter calibers, etc. So with different setups/calibers, not every single user observes a major shift in POI.
It is worth noting that the weight of the MS hanging off the muzzle also functions like having a tuner installed on the barrel; i.e. installing a movable weight at the end of the barrel. Sometimes this can also create a very noticeable effect on group size/shape, other users may not notice a big effect. The important thing to remember is that POI shift due to muzzle blast is a possibility regardless of how the unit is attached, and acting like a barrel tuner is a possibility when the MS is attached directly to the barrel. This is important because it is not easy to attach the unit in the exact same spot on the barrel every time; also, they can be prone to movement while attached to the barrel. None of these are necessarily deal-breakers, just things to be aware of when using the MS.
Anything that minimizes the muzzle blast will help minimize the shift in POI, such as increasing distance of the sensor deck from the muzzle blast, the use of a muzzle brake, which diverts some amount of the blast off to the side, the use of lighter calibers, etc. So with different setups/calibers, not every single user observes a major shift in POI.
It is worth noting that the weight of the MS hanging off the muzzle also functions like having a tuner installed on the barrel; i.e. installing a movable weight at the end of the barrel. Sometimes this can also create a very noticeable effect on group size/shape, other users may not notice a big effect. The important thing to remember is that POI shift due to muzzle blast is a possibility regardless of how the unit is attached, and acting like a barrel tuner is a possibility when the MS is attached directly to the barrel. This is important because it is not easy to attach the unit in the exact same spot on the barrel every time; also, they can be prone to movement while attached to the barrel. None of these are necessarily deal-breakers, just things to be aware of when using the MS.
