I think that this might be a new entry into the thread:
I realise presentation isn't everything but part of me can't help but look at the advert and the photo provided and just think "car boot sale". The advert definitely needs some work in terms of presentation and information. I'd also say that the price is a little on the optimistic side.
I've not done any price shopping beyond trying to identify what's there but the main event appears to be a Krytac Mk II Trident CRB which appears to be around the £335 brand new based off of Patrol Base's pricing, which is rarely the best out there. I've no idea what the chopped down abortion of an M4 is. I'm guessing the pistol is included but again who knows, given the advertiser fails to make any reference to it at all. Plus there are numerous items in the photo which aren't included in the sale.
Overall, another lazy advert which is asking far too much. At least in my opinion. Plus there's always the consideration that people are often better off breaking these up but again, that would require effort.