Armory Sponsor
Posted: 3/6/2015 5:49:46 PM EDT
|
Added a suppressor to my 18" SS WOA barrel (Gemtech Trek Ti).
I had anticipated it shooting LOW, that was not the case, it was 5-6" High. And this is from a rifle that was a tack driver. Once I adjusted the scope, its back to being a tack driver, only quieter. lol But does that seem odd that it was HIGH and not LOW when adding suppressor? No other changes were made to the AR, even the ammo was the same Hornady 75 gr BTHP. |
|
Several factors come into play with cans and POI changes.
First the weight of the can makes the barrel sag a bit. This is why a lot of people see a downward drop in POI and happens more with light barrels than heavy. Second the barrel harmonics change because the barrel is heavier with a can on it. This can shift POI in any direction. Third, if the can has asymmetric baffles the uneven gas pressure as the bullet goes thru a baffle can push it off center slightly. |
|
I'd add to this that you will generally see slightly higher velocities with the suppressor attached over the same barrel length with no suppressor. I've not heard of anyone doing a study as to why, but every chronograph comparison I've seen shows the increase.
The amateur engineer in me thinks that the suppressor acts as a longer barrel would in that it adds some (albeit reduced) acceleration pressure while still in the suppressor. All things being equal, you would then expect it to be a little higher than when un-suppressed. Just my 2 cents. SMS-ret |
|
Quoted:
The amateur engineer in me thinks that the suppressor acts as a longer barrel would in that it adds some (albeit reduced) acceleration pressure while still in the suppressor. All things being equal, you would then expect it to be a little higher than when un-suppressed. Just my 2 cents. SMS-ret I am a physicist and this is exactly what happens. |
|
Quoted:
I am a physicist and this is exactly what happens. Quoted:
Quoted:
The amateur engineer in me thinks that the suppressor acts as a longer barrel would in that it adds some (albeit reduced) acceleration pressure while still in the suppressor. All things being equal, you would then expect it to be a little higher than when un-suppressed. Just my 2 cents. SMS-ret I am a physicist and this is exactly what happens. Ok what about when you get a poi shift down? |
Armory Sponsor