Exhibit 10.5

JOINDER AGREEMENT TO REGISTRATION RIGHTS AGREEMENT
June 14, 2013
 
Reference is hereby made to the Registration Rights Agreement, dated as of
January 28, 2013 (the “Registration Rights Agreement”), by and among GENCORP
INC., AEROJET-GENERAL CORPORATION, MORGAN STANLEY & CO. LLC, CITIGROUP GLOBAL
MARKETS INC., WELLS FARGO SECURITIES, LLC and SUNTRUST ROBINSON HUMPHREY,
INC.  Unless otherwise defined herein, terms defined in the Registration Rights
Agreement and used herein shall have the meanings given them in the Registration
Rights Agreement.
 
1.           Joinder of the New Guarantors.  Each signatory hereto (each, a “New
Guarantor”), hereby agrees to become bound by the terms, conditions and other
provisions of the Registration Rights Agreement with all attendant rights,
duties and obligations stated therein, with the same force and effect as if
originally named as a “Guarantor” therein and as if each such New Guarantor
executed the Registration Rights Agreement on the date thereof.
 
2.           Governing Law. This Joinder Agreement, and any claim, controversy
or dispute arising under or related to this Joinder Agreement, shall be governed
by and construed in accordance with the laws of the State of New York.
 
3.           Counterparts.  This agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.  Delivery of an executed
counterpart of a signature page to this Joinder Agreement by facsimile, email or
other electronic transmission (i.e., “pdf”) shall be effective as delivery of a
manually executed counterpart of this Joinder Agreement.
 
4.           Amendments.  No amendment or waiver of any provision of this
Joinder Agreement, nor any consent or approval to any departure therefrom, shall
in any event be effective unless the same shall be in writing and signed by the
parties hereto.
 
5.           Headings.  The headings in this Joinder Agreement are for
convenience of reference only and shall not limit or otherwise affect the
meaning hereof.
 
 
[Signature Page Follows]
 
 
 

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IN WITNESS WHEREOF, the undersigned have executed this Joinder Agreement as of
the date first written above.
 

PRATT & WHITNEY ROCKETDYNE, INC., as New Guarantor
           
By:
/s/ Kathleen E. Redd
   
Name:
Kathleen E. Redd
   
Title:
Vice President and Treasurer
 

ARDE, INC., as New Guarantor
             
By:
/s/ Kathleen E. Redd
   
Name:
Kathleen E. Redd
   
Title:
Vice President and Treasurer
 

ARDE-BARINCO, INC., as New Guarantor
             
By:
/s/ Kathleen E. Redd
   
Name:
Kathleen E. Redd
   
Title:
Vice President and Treasurer
 

[Signature Page to Registration Rights Agreement Joinder]