Nothing is particularly prone to breakage. However, a spare LPK and a complete BCG with head-spaced bolt would get you back in the game in quick order. Honestly, the failure point on all mag fed guns is the magazine. Bring extras. If I had a choice between spare “parts” and spare magazines- spare magazines, every time.
That said, a tool kit sufficient to build the rifle in the field could be invaluable. I have everything but a vice at matches, just in case.