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See the attached pic: The original Tisas mainspring housing is on the left, the Ed Brown Drop-in Maxi-Well BL/25 LPI from Brownell's on the right. Notice the OEM part is larger and the ledge which captures the grip safety is further away from the frame. When inserting the drop-in mainspring housing into the Tisas, the grip safety is compressed enough by the mainspring housing that the grip safety is continuously engaged. I've used the same drop-in mainspring housing in my other 1911 without any issues.How do you know it's out of spec, I have a 1911 manual with a parts diagram with measurements: I would need to put some calipers on it see the size though if it's the frame or the part. Also I know a lot of budget 1911 have improper extractor tension seems to be a common problem including Springfield armory.
I admit my sample size of two is limited, and I'm also operating under the impression that the Ed Brown part is closer to spec. My mileage in this scenario is 1 out of 2