Our gun club uses Square with zero issues
Might try the same Visa company that Cabela's uses
#6 on the Square user agreement
See bolded parts
6. Your Square Account
By creating a Square Account, you confirm that you are either a legal resident of the United States, a United States citizen, or a business entity authorized to conduct business by the state(s) in which you operate. The Services and your Square Account may only be used for business purposes in the fifty states of the United States of America and the District of Columbia. You may not export the Services directly or indirectly, and you acknowledge that the Services may be subject to export restrictions imposed by US law, including US Export Administration Regulations (15 C.F.R. Chapter VII).
By creating a Square Account, you also confirm that you will not accept payments in connection with the following businesses or business activities: (1) any illegal activity or goods,
(2) buyers or membership clubs, including dues associated with such clubs,
(3) credit counseling or credit repair agencies, (4) credit protection or identity theft protection services, (5) direct marketing or subscription offers or services, (6) infomercial sales, (7) internet/mail order/telephone order pharmacies or pharmacy referral services (where fulfillment of medication is performed with an internet or telephone consultation, absent a physical visit with a physician including re-importation of pharmaceuticals from foreign countries), (8) unauthorized multi-level marketing businesses, (9) inbound or outbound telemarketers, (10) prepaid phone cards or phone services, (11) rebate based businesses, (12) up-sell merchants, (13) bill payment services, (14) betting, including lottery tickets, casino gaming chips, off-track betting, and wagers at races, (15) manual or automated cash disbursements, (16) prepaid cards, checks, or other financial merchandise or services, (17) sales of money-orders or foreign currency, (18) wire transfer money orders, (19) high-risk products and services, including telemarketing sales, (20) service station merchants, (21) automated fuel dispensers, (22) adult entertainment oriented products or services (in any medium, including internet, telephone, or printed material),
(23) sales of (i) firearms, firearm parts or hardware, and ammunition; or (ii) weapons and other devices designed to cause physical injury
(24) internet/mail order/telephone order cigarette or tobacco sales, (25) drug paraphernalia, (26) occult materials, (27) hate or harmful products, (28) escort services, (29) bankruptcy attorneys or collection agencies engaged in the collection of debt.
It could almost be argued that your club is violating two sections of #6....