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it would depend on what heat shield
Yes, it will fit the plain barrel models even with the tube extensions. The connection points remain the same.
It depends what model heat shields you are looking at. Interestingly thus model number isn't coming up on Mossberg site. The marinecoat Hartsfield they sell for 590 says Heat shield for your 12 Gauge 500 or 590 plain barrel with marinecote finish. Note: Not compatible with 590 7-Shot models w/ +1 extension, 590 Shockwave, 590A1, breacher barrels, or ghost ring sight barrels. This appears to be 6rd model with extension so it should work but you may want to verify before ordering the shield.
