use this to connect to the rails on the slice then more or less any sling will fit it http://www.ebay.co.uk/itm/Genuine-Magpul-RSA-Sling-Attachment-Mount-to-Weaver-Rail-/290878021030?pt=UK_SportingGoods_Hunting_ShootingSports_ET&hash=item43b9ae5da6
If you're using a stock get this:
http://ukmcpro.co.uk/index.php?page=shop.product_details&flypage=yagendoo_VaMazing_zoom2.tpl&product_id=2858&category_id=231&option=com_virtuemart&Itemid=316
Then pretty much any sling will do.
Hi Shay. I'm in the same-ish boat as you. I have a BT4 Ironhorse and been contemplating on a barrel upgrade. I believe the Apex 2 barrel for the Tippmann A5 would fit but I am not sure on its effectiveness in the up/down/left/right curve ability of it. I'm sure someone with the experience would pitch in.nice thanks also would an APEX barrel work good on a bt-4 combat slice