Crosman has the best customer support in the business.
Crosman also has some of the most expensive PCPs for what the offer.
Gunnar is just a Kral made PCP very similar to any other Kral PCP (NP03, Puncher, etc).
Kral also makes the Akela, Kratos and Cayden sold by Crosman.
I have 2 Kral NP03, which are decent but have short useable shot strings.
Still I like them a short light carbines, but I paid only $250 each.
On the other hand the Gunnar seems to be big and heavy, similar to Kratos.
The many Kral experts on this forum wil hopefuly give us their opinions.