californians buying high cap mags in free states WITHOUT ILLEGAL INTENT POSSIBLE? hunting?

i live in california, but i'm going to oregon soon to visit my family there. i dont know about gun shops in oregon. but here in california, they dont id you for buying magazines and accessories etc. do they check your id before you buy ar/ak magazines in oregon? i want to purchase them in oregon, because they litterally go for 1/3rd the price... i can litterally buy 3x as many standard capacity magazines for the same ammount of moneyif i mod them myself.

i'll take my pop rivet gun and pin them to accept no more than 10 rounds before heading home. its just that one pmag is $30.00 where i live, and in oregon they're $13.99 and i already have a pop rivet gun and rivets. i can save alot of money by buying them there. i mean if it doesn't work for me, i can always have a cousin buy them for me... but i wanna buy them there to save money regardless of how i obtain them. once i pin em they're ca legal anyways...

for you saying it's illegal. please clarify why? the magazines will be incapable of holding more than 10 rounds by the time i cross state lines. i can always just have my cousin buy them with his state issued drivers license if they really wanna be b*%hes about it lol.

reply to your edit, August.: the magazines ARE "INCAPABLE OF BEING CONVERTED TO HIGH CAPACITY MAGAZINES, IE: PINNED, CEMENTED CLOSED, 10 ROUND LIMITER." NONCONVERTIBLE... i already have a bunch of magazines i purchased in california modified exactly like the above that i purchased from a licensed ffl. and are 100% legal. my only REAL QUESTION IS "do they ask to see your id when you buy mags in Oregon, because they do NOT in california... i know 100% how to make a magazine ca legal.