Good day neighbors.  Taking a trip to enemy territory and my boy wants to take his MP15 22LR.  I was reading the PC and looks like since it is a rimfire it is legal to bring to California?  Keep up the struggle hopefully Saint Benitez will have good news soon.  Thanks all.  

PENAL CODE - PEN
PART 6. CONTROL OF DEADLY WEAPONS [16000 - 34370]  ( Part 6 added by Stats. 2010, Ch. 711, Sec. 6. )  
TITLE 4. FIREARMS [23500 - 34370]  ( Title 4 added by Stats. 2010, Ch. 711, Sec. 6. )  
DIVISION 10. SPECIAL RULES RELATING TO PARTICULAR TYPES OF FIREARMS OR FIREARM EQUIPMENT [30210 - 33690]  ( Division 10 added by Stats. 2010, Ch. 711, Sec. 6. )  
CHAPTER 2. Assault Weapons and .50 BMG Rifles [30500 - 31115]  ( Chapter 2 added by Stats. 2010, Ch. 711, Sec. 6. )  

ARTICLE 1. General Provisions [30500 - 30530]  ( Article 1 added by Stats. 2010, Ch. 711, Sec. 6. )
 
30515.  
(a) Notwithstanding Section 30510, “assault weapon” also means any of the following:

(1) A semiautomatic, centerfire rifle that does not have a fixed magazine but has any one of the following:

(A) A pistol grip that protrudes conspicuously beneath the action of the weapon.

(B) A thumbhole stock.

(C) A folding or telescoping stock.

(D) A grenade launcher or flare launcher.

(E) A flash suppressor.

(F) A forward pistol grip.

(2) A semiautomatic, centerfire rifle that has a fixed magazine with the capacity to accept more than 10 rounds.

(3) A semiautomatic, centerfire rifle that has an overall length of less than 30 inches.

(4) A semiautomatic pistol that does not have a fixed magazine but has any one of the following:

(A) A threaded barrel, capable of accepting a flash suppressor, forward handgrip, or silencer.

(B) A second handgrip.

(C) A shroud that is attached to, or partially or completely encircles, the barrel that allows the bearer to fire the weapon without burning the bearer’s hand, except a slide that encloses the barrel.

(D) The capacity to accept a detachable magazine at some location outside of the pistol grip.

(5) A semiautomatic pistol with a fixed magazine that has the capacity to accept more than 10 rounds.

(6) A semiautomatic shotgun that has both of the following:

(A) A folding or telescoping stock.

(B) A pistol grip that protrudes conspicuously beneath the action of the weapon, thumbhole stock, or vertical handgrip.

(7) A semiautomatic shotgun that does not have a fixed magazine.

(8) Any shotgun with a revolving cylinder.

(9) A semiautomatic centerfire firearm that is not a rifle, pistol, or shotgun, that does not have a fixed magazine, but that has any one of the following:

(A) A pistol grip that protrudes conspicuously beneath the action of the weapon.

(B) A thumbhole stock.

(C) A folding or telescoping stock.

(D) A grenade launcher or flare launcher.

(E) A flash suppressor.

(F) A forward pistol grip.

(G) A threaded barrel, capable of accepting a flash suppressor, forward handgrip, or silencer.

(H) A second handgrip.

(I) A shroud that is attached to, or partially or completely encircles, the barrel that allows the bearer to fire the weapon without burning the bearer’s hand, except a slide that encloses the barrel.

(J) The capacity to accept a detachable magazine at some location outside of the pistol grip.

(10) A semiautomatic centerfire firearm that is not a rifle, pistol, or shotgun, that has a fixed magazine with the capacity to accept more than 10 rounds.

(11) A semiautomatic centerfire firearm that is not a rifle, pistol, or shotgun, that has an overall length of less than 30 inches.

(b) For purposes of this section, “fixed magazine” means an ammunition feeding device contained in, or permanently attached to, a firearm in such a manner that the device cannot be removed without disassembly of the firearm action.

(c) The Legislature finds a significant public purpose in exempting from the definition of “assault weapon” pistols that are designed expressly for use in Olympic target shooting events. Therefore, those pistols that are sanctioned by the International Olympic Committee and by USA Shooting, the national governing body for international shooting competition in the United States, and that were used for Olympic target shooting purposes as of January 1, 2001, and that would otherwise fall within the definition of “assault weapon” pursuant to this section are exempt, as provided in subdivision (d).

(d) “Assault weapon” does not include either of the following:

(1) Any antique firearm.

(2) Any of the following pistols, because they are consistent with the significant public purpose expressed in subdivision (c):

MANUFACTURERMODELCALIBER
BENELLIMP90.22LR
BENELLIMP90.32 S&W LONG
BENELLIMP95.22LR
BENELLIMP95.32 S&W LONG
HAMMERLI280.22LR
HAMMERLI280.32 S&W LONG
HAMMERLISP20.22LR
HAMMERLISP20.32 S&W LONG
PARDINIGPO.22 SHORT
PARDINIGP-SCHUMANN.22 SHORT
PARDINIHP.32 S&W LONG
PARDINIMP.32 S&W LONG
PARDINISP.22LR
PARDINISPE.22LR
WALTHERGSP.22LR
WALTHERGSP.32 S&W LONG
WALTHEROSP.22 SHORT
WALTHEROSP-2000.22 SHORT
(3) The Department of Justice shall create a program that is consistent with the purposes stated in subdivision (c) to exempt new models of competitive pistols that would otherwise fall within the definition of “assault weapon” pursuant to this section from being classified as an assault weapon. The exempt competitive pistols may be based on recommendations by USA Shooting consistent with the regulations contained in the USA Shooting Official Rules or may be based on the recommendation or rules of any other organization that the department deems relevant.

(e) The provisions of this section are severable. If any provision of this section or its application is held invalid, that invalidity shall not affect other provisions or applications that can be given effect without the invalid provision or application.

(Amended by Stats. 2020, Ch. 29, Sec. 38. (SB 118) Effective August 6, 2020.)

To qualify as an assault weapon, it has to be both semiautomatic and centerfire.  So, no, rimfires are not assault weapons.

I forgot to mention, the ban on magazines holding over 10 rounds DOES apply, even to rimfire.

Thank you very much.  Thats the way I understood it...but I am not an expert.

Nor am I, I am merely one of the millions of victims of these unconstitutional laws.

I feel for you.  Keep up the fight.  Hopefully Benitez will prevail.