This MKIII 22/45 is the 5 1/2" bull barrel blue steel model with adjustable sights. Just to let you know --- it was perfect over about 100 rounds of CCI Mini Mags. I was prepared to quickly remove the LCI if I experienced and feeding/extraction problems but not a one. Trigger decent. Sights from the factory had a pronounced left bias but adjusted that out quickly. Very happy and pleased with this product.