Primary Arms offers a picatinny rail specifically for the 2.5x Prism. MPN: 210001
No, this is made in China.
No, the carry handle screw is not included.
Eye relief is listed under the Specifications on this page and is 2.7". In regards to the field of view, if it is 37.5 feet at 100 yards than double that is 75 feet.
The Primary Arms SLx Series 2.5 x 32 mm Red Dot Sight is currently unavailable. However, the Primary Arms prism sight at the link below will work well for a 9mm Carbine.
https://www.opticsplanet.com/primary-arms-slx-1x-micro-prism-scope.html?_iv_reticle=acss-gemini-9mm
Primary Arms SLx Series 2.5 x 32 mm Red Dot Sight has a reticle designed for use with 5.56 NATO, .223 Remington, 5.45x39mm, and .308 Winchester. It could be used with a Henry Big Boy 44 Magnum but the reticle hold overs will not necessarily be accurate for that cartridge.
The Primary Arms SLx Series 2.5 x 32 mm Red Dot Sight can be zeroed at 50 yards with 220gr @ 1,010 fps (sub) 300 Blackout ammunition with the center dot. The optic will also include a manual that provides the holds for 300 Blackout at various distances using the ammunition specified. You can also email us at Techsales@opticsplanet.com for more information regarding the reticle.
To fit the Primary Arms 2.5 x 32 mm Rifle Scope to your carry handle, you will need to purchase and install a carry handle picatinny rail like the NcSTAR AR Carry Handle Mount w/ Picatinny Rail, found by using the link below:
https://www.opticsplanet.com/ncstar-ar-carry-handle-mount-w-picatinny-rail.html
The Primary Arms SLx Series 2.5 x 32 mm Red Dot Sight might fit the Texas Weapon Systems Bitty Dot Mount with Picatinny Rail at the link below.
https://www.opticsplanet.com/texas-weapon-systems-bitty-dot-mount-with-picatinny-rail.html
You would need to purchase a picatinny carry handle mount like the NcSTAR AR Carry Handle Mount w/ Picatinny Rail, found by using the link below:
https://www.opticsplanet.com/ncstar-ar-carry-handle-mount-w-picatinny-rail.html