I like this. A lot.
But the wiki says that it increases melee attack speed, and so does the in-game description.
However, if I put it on, and inspect my own character, it says under the added effects for my guns "Attack Speed Increase: High" and I do notice my guns firing faster as well
Note to OOO:
If you fix this in a patch later, PLEASE introduce another buckler for gun attack speed increase as well. And possibly adding more special effect shields like the Swiftstrike Buckler?
I agree it's a bit confusing. Either Swiftstrike Buckler description should be amended or it should affact only melee weapons and new buckler for hanguns ASI should be introduced as Meowreka suggested.
Personally, as an owner of Swiftstrike Buckler level 10, I'd rather see just description get changed.