Hello:
Some more things to consider, please:
Before making any alterations/changes, get it in writing from importer that the Warranty will not be voided.
Patience, patience.
As Two Flints commented, wait to see how it groups with the ammo you will end up using.
Just shoot to evaluate group size at 50 yards. Two inches should be reasonable.
Set your offset aiming point so you can get groups on paper SAFELY, INTO, not over backstop or into ground.
Shoot from a solid rest on a solid bench. With heavy trigger pull, just keep up a steady squeeze, but get your shots off in under FIVE seconds from the start of aiming. Watch the front sight and try not to transfer focus back and forth between rear and front. Holding your visual aiming over five seconds usually "burns" the picture into your eye much like a blast of bright light. The true sight picture can shift if this happens and you don't "see" that. So, align sights, blink twice to evenly distribute eye moisture (this does matter) and get shot off. If hold over five, start over and look away and blink. This was shared with me by Gary Anderson, an Olympic shooter of renown.
The carbine has a sight radius of close to 17.75" so at 50 yards, each .010" of front blade or rear leaf height change is worth 1 inch. After scribing a line on one side of the post, I "DRAW" file the sight post with a single-cut mill file for final height. Try to make the top FLAT surface of the blade ANGLED DOWNWARD, barely lower at its front to reduce it creating glare, which can shift zero in bright light. Do changes in stages to avoid excessive removal. You can also glue a simple overlay on the rear sight with elevated notch to reduce the amount of front post cutting. Many competitors prefer a higher post to minimize barrel mirage interfering with sight picture.
I suggest you shoot a couple hundred rounds to learn to hold, aim and follow through off the rest. Try to place minimal body pressure on the gun to minimize pushing the gun during recoil while the bullet is STILL in barrel.
The relatively heavy hammer fall can create vibration and some sight picture disturbance. Put a little, but consistent shoulder pressure on the butt. Don't "lean into it", though.
Your zero when shooting off a relatively hard rest will usually change, not too much though, versus shooting offhand. But you need to know group size.
These imports can be fine for a while and then present issues after a bit of use. Again, get it to group first.
One more thing:
PYRODEX may create some unexpected rusting issues unless the gun is "cleaned as if trad black powder has been used" - Hodgdon's guidance! Clean well, right after use with room temp, not boiling, water as if corrosive primed ammo has been shot. Check bore daily for a week.
Please keep us posted here on progress and welcome to the group.
Respectfully,
El Supremo/Kevin Tinny