Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.
We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.
by TC, from TX, United States Asked on March 12, 2019
The difference is the physical diameter of the pins. Small pins are approximately .154 diameter while large are .169. If you lower receiver was manufactured by Colt between the years of 1991-2009 it may use a large pin trigger. If you lower receiver is not Colt or was manufactured outside of those years then it will use a small pin trigger.