Just remember that the upgrade kit is NOT meant for Mid Length Gas Systems. (16" and longer barrels.) You will probably experience excessive extraction tension. The upgrade kits are for 14.5" barrel systems and shorter. If your weapon runs without the upgrade, this is telling you something. You can run a heavier spring and black buffer insert, and should be good to go, but when you replace your extractor spring, it's a good idea to replace your ejector spring as well to compensate for the extra extractor tension.
This issue has been covered extensively in the last 6 months. Do a search for more info.
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