Next time out you should do your own experiment and prove it to yourself one way or the other.
Use the same lot / can of ammo and compare your Colt SOCOM to your Colt pencil after shooting them both under the same firing schedule. (same number of rounds / time before shooting for groups)
Forget what you read on the internet and test for yourself!
Since you have both kinds, take both to the range and shoot them side by side under the same conditions.
I do not own any pencil barrels (and won't) but have done exactly as I describe comparing my gov profile Colt stuff to HBAR Colt barrels and Match type BULL barrels. (all 16" in my testing / comparisons)
For reference:
14.5 Colt SOCOM barrel weight (stripped) is 1lb 14oz,
14.5" Colt 6920 Gov profile barrel (stripped) is 1lb 9oz,
16" Colt 6520 'pencil' barrel (stripped) is 1lb 6oz,
16" Colt 6920 Gov profile barrel (stripped) is 1lb 12oz,
16" Colt 6721 HBAR barrel (stripped) is 2lbs 3.4oz,
16" SS, BULL type barrels clock in right at 3lbs (stripped / no fluting).
From left to right - 2lb 3.4oz, 2lb, and 1lb 12oz:
85lbs:
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