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                                                                    EXHIBIT 99.2
                         NOTICE OF GUARANTEED DELIVERY
 
                   9 3/4% SENIOR SUBORDINATED NOTES DUE 2008
          FLOATING INTEREST RATE SUBORDINATED TERM SECURITIES DUE 2008
                                      AND
                  12 1/2% SENIOR EXCHANGEABLE PREFERRED STOCK
                                       OF
                                   MCMS, INC.
              PURSUANT TO THE PROSPECTUS DATED             , 1998
 
This form must be used by a holder of 9 3/4% Senior Subordinated Notes due 2008
(the "Fixed Rate Notes"), a holder of Floating Interest Rate Subordinated Term
Securities due 2008 (the "Floating Rate Notes" and, together with the Fixed Rate
Notes, the "Notes") and/or a holder of 12 1/2% Senior Exchangeable Preferred
Stock (the "Preferred Stock" and, together with the Notes, the "Securities") of
MCMS, Inc., an Idaho corporation (the "Company"), who wishes to tender
Securities to the Exchange Agent pursuant to the guaranteed delivery procedures
described in "The Exchange Offer -- Guaranteed Delivery Procedures" of the
Company's Prospectus, dated           , 1998 (the "Prospectus") and in
Instruction 2 to the related Letter of Transmittal. Any holder who wishes to
tender Securities pursuant to such guaranteed delivery procedures must ensure
that the Exchange Agent receives this Notice of Guaranteed Delivery prior to the
Expiration Date of the Exchange Offer. Capitalized terms used but not defined
herein have the meanings ascribed to them in the Prospectus or the Letter of
Transmittal.
 
THE EXCHANGE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., NEW YORK CITY
TIME, ON           , 1998 UNLESS EXTENDED (THE "EXPIRATION DATE").
 
                    United States Trust Company of New York
                             (the "Exchange Agent")
 

                                                                                  
     By Hand after 4:30 p.m. on the                By Hand before 4:30 p.m.:                By Registered or Certified Mail:
      Expiration Date only/Overnight        United States Trust Company of New York     United States Trust Company of New York
                 Courier:                                 111 Broadway                        P.O. Box 843 Cooper Station
United States Trust Company of New York             New York, New York 10006                    New York, New York 10276
   770 Broadway Avenue -- 13th Floor         Attention: Lower Level Corporate Trust      Attention: Corporate Trust Operations
        New York, New York 10003                             Window                                      Window
  Attention: Corporate Trust Services

 
     DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE
WILL NOT CONSTITUTE A VALID DELIVERY.
 
     This form is not to be used to guarantee signatures. If a signature on a
Letter of Transmittal is required to be guaranteed by an "Eligible Institution"
under the instructions thereto, such signature guarantee must appear in the
applicable space provided in the signature box on the Letter of Transmittal.
 
LADIES AND GENTLEMEN:
 
     The undersigned hereby tenders to the Company, upon the terms and subject
to the conditions set forth in the Prospectus and the related Letter of
Transmittal, receipt of which is hereby acknowledged, the principal amount of
Notes and/or the shares of Preferred Stock set forth below pursuant to the
guaranteed delivery procedures set forth in the Prospectus and in Instruction 2
of the Letter of Transmittal.
 
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     The undersigned hereby tenders the Fixed Rate Notes listed below:
 


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  CERTIFICATE NUMBER(S) (IF KNOWN) OF FIXED RATE NOTES OR      AGGREGATE PRINCIPAL     AGGREGATE PRINCIPAL
         ACCOUNT NUMBER AT THE BOOK-ENTRY FACILITY             AMOUNT REPRESENTED        AMOUNT TENDERED
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     The undersigned hereby tenders the Floating Rate Notes listed below:
 


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 CERTIFICATE NUMBER(S) (IF KNOWN) OF FLOATING RATE NOTES OR    AGGREGATE PRINCIPAL     AGGREGATE PRINCIPAL
         ACCOUNT NUMBER AT THE BOOK-ENTRY FACILITY             AMOUNT REPRESENTED        AMOUNT TENDERED
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     The undersigned hereby tenders the Preferred Stock listed below:
 


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   CERTIFICATE NUMBER(S) (IF KNOWN) OF PREFERRED STOCK OR       AGGREGATE SHARES        AGGREGATE SHARES
         ACCOUNT NUMBER AT THE BOOK-ENTRY FACILITY                 REPRESENTED              TENDERED
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                            PLEASE SIGN AND COMPLETE
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   Signatures of Registered Holder(s) or
   Authorized Signatory:--------------------------------
                                                          Date:------------------------------------------, 1998
 
   -----------------------------------------------------  Address:-----------------------------------------------
 
   -----------------------------------------------------
                                                          --------------------------------------------------------
 
   Name(s) of
   Registered Holder(s): -------------------------------  Area Code and
                                                          Telephone No.----------------------------------------
 
   -----------------------------------------------------
 
   -----------------------------------------------------

 
        This Notice of Guaranteed Delivery must be signed by the Holder(s)
   exactly as their name(s) appear on certificates for the Securities or on a
   security position listing as the owner of Securities, or by person(s)
   authorized to become Holder(s) by endorsements and documents transmitted
   with this Notice of Guaranteed Delivery. If signature is by a trustee,
   executor, administrator, guardian, attorney-in-fact, officer or other
   person acting in a fiduciary or representative capacity, such person must
   provide the following information.
 
                      Please print name(s) and address(es)
 
   Name(s):
   --------------------------------------------------------------------------
 
   --------------------------------------------------------------------------
 
   Capacity:
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   Address(es):
   --------------------------------------------------------------------------
 
   --------------------------------------------------------------------------
 
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                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
The undersigned, a firm which is a member of a registered national securities
exchange or of the National Association of Securities Dealers, Inc., or is a
commercial bank or trust company having an office or correspondent in the United
States, or is otherwise an "eligible guarantor institution" within the meaning
of Rule 17Ad-15 under the Securities Exchange Act of 1934, as amended,
guarantees deposit with the Exchange Agent of the Letter of Transmittal (or
facsimile thereof), together with the Securities tendered hereby in proper form
for transfer (or confirmation of the book-entry transfer of such Securities into
the Exchange Agent's account at the Book-Entry Transfer Facility described in
the Prospectus under the caption "The Exchange Offer -- Guaranteed Delivery
Procedures" and in the Letter of Transmittal) and any other required documents,
all by 5:00 p.m., New York City time, on the third New York Stock Exchange
trading day following the Expiration Date.
 

                                                
Name of firm ---------------------------------     -------------------------------
                                                   (AUTHORIZED SIGNATURE)
Address --------------------------------------     Name --------------------------
                                                                   (Please Print)

- ----------------------------------------------     Title--------------------------
(Include Zip Code)

Area Code and                                      Dated -------------------, 1998
Tel. No. -------------------------------------

 
DO NOT SEND SECURITIES WITH THIS FORM. ACTUAL SURRENDER OF SECURITIES MUST BE
MADE PURSUANT TO, AND BE ACCOMPANIED BY, AN EXECUTED LETTER OF TRANSMITTAL.
 
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                 INSTRUCTIONS FOR NOTICE OF GUARANTEED DELIVERY
 
     1. Delivery of this Notice of Guaranteed Delivery.  A properly completed
and duly executed copy of this Notice of Guaranteed Delivery and any other
documents required by this Notice of Guaranteed Delivery must be received by the
Exchange Agent at its address set forth herein prior to the Expiration Date. The
method of delivery of this Notice of Guaranteed Delivery and any other required
documents to the Exchange Agent is at the election and sole risk of the holder,
and the delivery will be deemed made only when actually received by the Exchange
Agent. If delivery is by mail, registered mail with return receipt requested,
properly insured, is recommended. As an alternative to delivery by mail, the
holders may wish to consider using an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure timely delivery. For a
description of the guaranteed delivery procedures, see Instruction 2 of the
Letter of Transmittal.
 
     2. Signatures on this Notice of Guaranteed Delivery.  If this Notice of
Guaranteed Delivery is signed by the registered holder(s) of the Securities
referred to herein, the signature must correspond with the name(s) written on
the face of the Securities without alteration, enlargement, or any change
whatsoever. If this Notice of Guaranteed Delivery is signed by a participant of
the Book-Entry Transfer Facility whose name appears on a security position
listing as the owner of the Securities, the signature must correspond with the
name shown on the security position listing as the owner of the Securities.
 
     If this Notice of Guaranteed Delivery is signed by a person other than the
registered holder(s) of any Securities listed or a participant of the Book-Entry
Transfer Facility, this Notice of Guaranteed Delivery must be accompanied by
appropriate securities powers, signed as the name of the registered holder(s)
appears on the Securities or signed as the name of the participant shown on the
Book-Entry Transfer Facility's security position listing.
 
     If this Notice of Guaranteed Delivery is signed by a trustee, executor,
administrator, guardian, attorney-in-fact, officer of a corporation, or other
person acting in a fiduciary or representative capacity, such person should so
indicate when signing and submit with the Letter of Transmittal evidence
satisfactory to the Company of such person's authority to so act.
 
     3. Requests for Assistance or Additional Copies.  Questions and requests
for assistance and requests for additional copies of the Prospectus may be
directed to the Exchange Agent at the address specified in the Prospectus.
Holders may also contact their broker, dealer, commercial bank, trust company,
or other nominee for assistance concerning the Exchange Offer.
 
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