Tuning Impact MK2 help....

While shooting my MK2 .30 yesterday these two screws fell out. I can not find where they came from on the parts diagram or any empty spots. Does anyone have an idea? Gun has over 1000 shots through it and I took one additional shot after the last screw fell out which didn't seem to affect the gun.

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some pics to help with this issue. the grub screws the OP asked about are the FX no limit picatinny mount adjusters.

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this pic shows the location of them in the scope mounts. they are the ones sticking out in the pic at the bottom of the scope mounts. they are also 1.5mm grub screws.

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also the Picatinny mounts in the fx no limit line are the only ones that have this adjustment screw.