Those push on cans smoke everything else for noise suppression. No substitute for suppressor internal volume.
Biggest improvement for mine was a trigger job. Got the Volquatsen kit, and groups closed up well.
Mine had over 20k rounds through it over 20ish years, so the BCG and action were smoothed out nicely. A friend got a new one, and it was rough as guts. Some polishing grit and elbow grease smoothed the internals out.
I can also elaborate on what upgrades did not work well:
Replacing the factory sporter barrel with a Gun City carbon tension barrel - no accuracy improvement, and ended up with ejection problems. The supplied suppressor was rubbish.
Hogue stock. The barrel channel was not straight, so the barrel would touch the stock. How much depended on whether I was using the bipod, or shooting off hand. Too flimsy to be useful.
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