If you want to capture the airsoft sniping action via the scope, here is one way of mounting a smartphone to the scope. Mach Sakai reviews this product that can be ordered at Amazon.jp. With smartphones' videos now at full HD or 4K resolutions, you can capture high quality videos without needing any other action cam if you are on a budget. We would recommend this for DMRs rather than bolt-action rifles as it tends to get in the way when you pull bolt.

Airsoft Keks does 4K reviews now and you better have good bandwidth and a 4K monitor to watch this in its full glory... "An English Dub by Jack from our latest Review. This video was filmed in 4K, streaming it in 1440p or 4K gives you a wider bandwith and can increase the video quality, even when you watch it on a monitor which has a lower resolution."