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for a single action 1911 the biggest difference is that springfield submitted a gun and paid for the testing to show it complies with MA law. MA compliant 1911's are required to have a second serial number inside the receiver and have a loaded chamber indicator

Hi George and welcome. Standard STX trigger pull averages 7lbs and the MA version has a 10lb trigger pull with Loaded Chamber Indicator. Cheers, stay safe and enjoy!

Hi George, the trigger weight is not heavier. It is the same gun with a different model number, which is MA approved. The SIG SAUER 1911 is equipped with a thumb safety. When engaged, the thumb safety mechanically blocks the movement of the sear, preventing release of the hammer. A "hammer-deactivation device" feature nullifies the 10lb trigger requirement. It also has a loaded chamber indicator, which along with the safety makes it MA compliant. As Randy stated, this gun was submitted & tested to show it complies with MA law. Stay safe & have a great day!