How to tune the Sub 12 FX M4

Hi guys got a video here today on the FX M4 and in this one ill go over the tuning process for a sub 12 lb/ft rifle. Crawley surplus store: https://www.surplusstore.co.uk/ Discount code max 2 uses per customer / email: SUB12AIRGUNNERS Quick tune lock: https://www.ebay.co.uk/itm/376611370029 Bagnall and kirkwood quick tune system: https://spares.bagnallandkirkwood.co.... Bagnall and Kirkwood 750 power plenum: https://spares.bagnallandkirkwood.co.... Bagnall and kirkwood barrel: https://spares.bagnallandkirkwood.co.... My Ebay store: https://www.ebay.co.uk/usr/sub12airgu... Outgun store: https://www.outgun.shop/?ref=SUB12Air... Discount code: SUB12 OLED Gauge: https://www.outgun.shop/products/outg... LED Gauge: https://www.outgun.shop/products/outg... Angled gauge bracket: https://www.outgun.shop/products/angl... Cocking handles: https://www.outgun.shop/collections/c...