I'm shooting a 12-GA Model 12 in two overlapping trap leagues (16-YD singles) at the moment. This particular gun dates to 1953. It apparently started life as a field gun, but a previous owner tricked it out to shoot trap. It now sports a Simmons ventilated rib and trap wood - and the bolt and lifter have both been jeweled. It's a good shooter and fits me well.
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So, anyway - last night at the club - a fellow shooter came over to look my gun over and cautioned me to "be careful." He said that field guns weren't made to shoot thousands of rounds, the way trap guns were. The implication was that, since my gun started out as a field gun, it wasn't manufactured to be as robust as a trap gun and likely wouldn't hold up as well. That struck me as implausible, but he used the 870 TC as an example - he said that they are noticeably heavier that field-grade 870s.
I've been around a while and have never heard that line of thinking. I alsways assumed that a Winchester Model 12 field gun would have been manufactured to be every bit as solid and robust as a Model 12 trap gun.
Have I been wrong all these years?
TIA,I don't know about model 12's but I have purchased a spare parts kit from Beretta for the 686 series and they provide different parts,springs firing pins sears etc. for field vs. competition.
I don't know what this means re your question but there appear to be some differences between field and competition other than the wood with some manufacturers at least.