JBL, Competition Magnum XHD All Spearguns >>> Spearguns by JBL More details and ordering info. Nearly identical to the Magnum guns, but more rugged, and longer lasting. Using more heat-treated steel and more powerful slings, these guns provide longevity and power in one. User input on Competition Magnum XHD by JBL: Be the first to submit input on this product Submit Input: Your Name: Write or Paste Input here: Upload picture:      Review Guidelines